Death of the testator. When was the Lord’s last will and testament written?

Death of the testator 

Question:

When was the Lord’s last will and testament written?

The scholars who are held in high esteem will teach the new testament was written after the Lord died on the cross.

Since when is a last will and testament written after the death of the testator?

What court of law would accept such a Will and Testament?

The key words in Hebrew 9 line 16 is the word (is); For where a testament (is); and then for that Will which is already written to go into effect, the testator must die.

For where a testament is, there must also of necessity be the death of the testator.  Hebrews 9:16
For a testament is of force after men are dead: otherwise it is of no strength at all while the testator liveth.  Hebrews 9:17 

The new testament went into effect when the Lord gave up the ghost! 

And Jesus cried with a loud voice, and gave up the ghost.  Mark 15:37

And when the centurion, which stood over against him, saw that he so cried out, and gave up the ghost, he said, Truly this man was the Son of God.  Mark 15:39

And when Jesus had cried with a loud voice, he said, Father, into thy hands I commend my spirit: and having said thus, he gave up the ghost.  Luke 23:46

When Jesus therefore had received the vinegar, he said, It is finished: and he bowed his head, and gave up the ghost.  John 19:30 

To all those who profess otherwise:

Then I sent unto him, saying, There are no such things done as thou sayest, but thou feignest them out of thine own heart.  Nehemiah 6:8 

For when Moses had spoken every precept to all the people according to the law, he took the blood of calves and of goats, with water, and scarlet wool, and hyssop, and sprinkled both the book, and all the people,  Hebrews 9:19
For I have not shunned to declare unto you all the counsel of God.  Acts 20:27
The counsel of the LORD standeth for ever, the thoughts of his heart to all generations.  Psalms 33:11

For ever, O LORD, thy word is settled in heaven.  Psalms 119:89

But he answered and said, It is written, Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God.  Matthew 4:4

Question:
When did every word of God proceed out of his mouth?

Answer:

Remember the former things of old: for I am God, and there is none else; I am God, and there is none like me,  Isaiah 46:9
Declaring the end from the beginning, and from ancient times the things that are not yet done, saying, My counsel shall stand, and I will do all my pleasure:  Isaiah 46:10

Have not I written to thee excellent things in counsels and knowledge,  Proverbs 22:20
That I might make thee know the certainty of the words of truth; that thou mightest answer the words of truth to them that send unto thee?  Proverbs 22:21
Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God.  Hebrews 12:2

The thing that hath been, it is that which shall be; and that which is done is that which shall be done: and there is no new thing under the sun.  Ecclesiastes 1:9
Is there any thing whereof it may be said, See, this is new? it hath been already of old time, which was before us.  Ecclesiastes 1:10
Seek ye out of the book of the LORD, and read: no one of these shall fail, none shall want her mate: for my mouth it hath commanded, and his spirit it hath gathered them.  Isaiah 34:16
And he hath cast the lot for them, and his hand hath divided it unto them by line: they shall possess it for ever, from generation to generation shall they dwell therein.  Isaiah 34:17 

And ye shall eat old store, and bring forth the old because of the new. Leviticus 26:10
Then said he unto them, Therefore every scribe which is instructed unto the kingdom of heaven is like unto a man that is an householder, which bringeth forth out of his treasure things new and old. Matthew 13:52

The old and new testaments of the Lord were known by Adam; and Adam knew the new testament would begin when the Lord God laid down his life for us and fulfilled the scriptures at the appointed time. 

Hereby perceive we the love of God, because he laid down his life for us: and we ought to lay down our lives for the brethren.  1 John 3:16 

For where a testament is, there must also of necessity be the death of the testator.  Hebrews 9:16
For a testament is of force after men are dead: otherwise it is of no strength at all while the testator liveth.  Hebrews 9:17