THE BOOK OF PSALMS.
CHAPTER 55:
17 Evening, and morning, and at noon, will I pray, and cry aloud: and he shall hear my voice.

THE FIRST EPISTLE OF PAUL THE APOSTLE TO THE THESSALONIANS.
CHAPTER 5:
17 Pray without ceasing.
18 In every thing give thanks: for this is the will of God in Christ Jesus concerning you.