The natural water baptism is but a token of the spiritual water baptism.

Example of that which is of the flesh is but for a token, (a sign of witness, and profession of faith) for that which is spiritual:

Blessed is the man to whom the Lord will not impute sin. Romans 4:8
Cometh this blessedness then upon the circumcision only, or upon the uncircumcision also? for we say that faith was reckoned to Abraham for righteousness. Romans 4:9
How was it then reckoned? when he was in circumcision, or in uncircumcision? Not in circumcision, but in uncircumcision. Romans 4:10
And he received the sign of circumcision, a seal of the righteousness of the faith which he had yet being uncircumcised: that he might be the father of all them that believe, though they be not circumcised; that righteousness might be imputed unto them also: Romans 4:11

And ye shall circumcise the flesh of your foreskin; and it shall be a token of the covenant betwixt me and you. Genesis 17:11
And I will give them one heart, and I will put a new spirit within you; and I will take the stony heart out of their flesh, and will give them an heart of flesh: Ezekiel 11:19
That they may walk in my statutes, and keep mine ordinances, and do them: and they shall be my people, and I will be their God. Ezekiel 11:20
A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh. Ezekiel 36:26
And I will put my spirit within you, and cause you to walk in my statutes, and ye shall keep my judgments, and do them. Ezekiel 36:27
In that ye have brought into my sanctuary strangers, uncircumcised in heart, and uncircumcised in flesh, to be in my sanctuary, to pollute it, even my house, when ye offer my bread, the fat and the blood, and they have broken my covenant because of all your abominations. Ezekiel 44:7
Thus saith the Lord GOD; No stranger, uncircumcised in heart, nor uncircumcised in flesh, shall enter into my sanctuary, of any stranger that is among the children of Israel. Ezekiel 44:9

Circumcise therefore the foreskin of your heart, and be no more stiffnecked. Deuteronomy 10:16
And the LORD thy God will circumcise thine heart, and the heart of thy seed, to love the LORD thy God with all thine heart, and with all thy soul, that thou mayest live. Deuteronomy 30:6
Circumcise yourselves to the LORD, and take away the foreskins of your heart, ye men of Judah and inhabitants of Jerusalem: lest my fury come forth like fire, and burn that none can quench it, because of the evil of your doings. Jeremiah 4:4

The following are precepts and my reasoning with those who professed, in error, the natural water baptism was required to be saved.

There is the doctrine of baptisms and the natural water baptism is only a token, as is the circumcision of the flesh is a token of that which is spiritual.

It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.  John 6:63

Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost;  Titus 3:5

That he might sanctify and cleanse it with the washing of water by the word,  Ephesians 5:26

For when for the time ye ought to be teachers, ye have need that one teach you again which be the first principles of the oracles of God; and are become such as have need of milk, and not of strong meat. Hebrews 5:12
For every one that useth milk is unskilful in the word of righteousness: for he is a babe. Hebrews 5:13
But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil. Hebrews 5:14
Therefore leaving the principles of the doctrine of Christ, let us go on unto perfection; not laying again the foundation of repentance from dead works, and of faith toward God, Hebrews 6:1
Of the doctrine of baptisms, and of laying on of hands, and of resurrection of the dead, and of eternal judgment. Hebrews 6:2

Now concerning the natural water baptism, such a baptism is not done as we find in so many congregations (sprinkling of water by one on another; nor one putting the other under the water); the baptism by natural water as the token of the spiritual baptism is done on this wise.

The eunuch and Philip both went into the water; both Philip and the eunuch as we find in the holy scriptures and not by the traditions of men.

And as they went on their way, they came unto a certain water: and the eunuch said, See, here is water; what doth hinder me to be baptized? Acts 8:36
And Philip said, If thou believest with all thine heart, thou mayest. And he answered and said, I believe that Jesus Christ is the Son of God. Acts8:37
And he commanded the chariot to stand still: and they went down both into the water, both Philip and the eunuch; and he baptized him. Acts 8:38
And when they were come up out of the water, the Spirit of the Lord caught away Philip, that the eunuch saw him no more: and he went on his way rejoicing. Acts 8:39

Such a natural water baptism is a token of this spiritual work of the Lord Jesus.  This spiritual baptism is the same which the malefactor received who was saved by the Lord when he believed the precious promises of the LORD by faith; and it was not the natural water baptism which the eunuch received:

John 3:3-6
Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God.
[4] Nicodemus saith unto him, How can a man be born when he is old? can he enter the second time into his mother’s womb, and be born? [5] Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God.
[6] That which is born of the flesh is flesh; and that which is born of the Spirit is spirit.

1 Corinthians 10:1-4
Moreover, brethren, I would not that ye should be ignorant, how that all our fathers were under the cloud, and all passed through the sea;
[2] And were all baptized unto Moses in the cloud and in the sea; [3] And did all eat the same spiritual meat;
[4] And did all drink the same spiritual drink: for they drank of that spiritual Rock that followed them: and that Rock was Christ.

Isaiah 41:17
When the poor and needy seek water, and there is none, and their tongue faileth for thirst, I the LORD will hear them, I the God of Israel will not forsake them.

John 4:5-14
Then cometh he to a city of Samaria, which is called Sychar, near to the parcel of ground that Jacob gave to his son Joseph.
[6] Now Jacob’s well was there. Jesus therefore, being wearied with his journey, sat thus on the well: and it was about the sixth hour.
[7] There cometh a woman of Samaria to draw water: Jesus saith unto her, Give me to drink.
[8] (For his disciples were gone away unto the city to buy meat.) [9] Then saith the woman of Samaria unto him, How is it that thou, being a Jew, askest drink of me, which am a woman of Samaria? for the Jews have no dealings with the Samaritans.
[10] Jesus answered and said unto her, If thou knewest the gift of God, and who it is that saith to thee, Give me to drink; thou wouldest have asked of him, and he would have given thee living water.
[11] The woman saith unto him, Sir, thou hast nothing to draw with, and the well is deep: from whence then hast thou that living water?
[12] Art thou greater than our father Jacob, which gave us the well, and drank thereof himself, and his children, and his cattle? [13] Jesus answered and said unto her, Whosoever drinketh of this water shall thirst again:
[14] But whosoever drinketh of the water that I shall give him shall never thirst; but the water that I shall give him shall be in him a well of water springing up into everlasting life.

John 7:37-38
In the last day, that great day of the feast, Jesus stood and cried, saying, If any man thirst, let him come unto me, and drink.
[38] He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water.

Song of Solomon 4:15
A fountain of gardens, a well of living waters, and streams from Lebanon.

Revelation 21:6
And he said unto me, It is done. I am Alpha and Omega, the beginning and the end. I will give unto him that is athirst of the fountain of the water of life freely.

That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. Romans 10:9

For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. Romans 10:10
And one of the malefactors which were hanged railed on him, saying, If thou be Christ, save thyself and us. Luke 23:39
But the other answering rebuked him, saying, Dost not thou fear God, seeing thou art in the same condemnation? Luke 23:40
And we indeed justly; for we receive the due reward of our deeds: but this man hath done nothing amiss. Luke 23:41
And he said unto Jesus, Lord, remember me when thou comest into thy kingdom. Luke 23:42
And Jesus said unto him, Verily I say unto thee, To day shalt thou be with me in paradise. Luke 23:43 

Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost; Titus 3:5
That he might sanctify and cleanse it with the washing of water by the word, Ephesians 5:26
If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God. Colossians 3:1
Set your affection on things above, not on things on the earth. Colossians 3:2
For ye are dead, and your life is hid with Christ in God. Colossians 3:3
When Christ, who is our life, shall appear, then shall ye also appear with him in glory. Colossians 3:4

Behold, what manner of love the Father hath bestowed upon us, that we should be called the sons of God: therefore the world knoweth us not, because it knew him not. 1 John 3:1
Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is. 1 John 3:2
And ye know that he was manifested to take away our sins; and in him is no sin. 1 John 3:5
Looking for that blessed hope, and the glorious appearing of the great God and our Saviour Jesus Christ; Titus 2:13

Beryl

p.s. the last 5 lines of the precepts above are set in order to once again prove the Lord Jesus is both the Son and the Father; for it is the Lord Jesus who will appear and he alone is doing the appearing and not another.

For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace. Isaiah 9:6