New Revised Standard Version
This book of the law shall not depart out of your mouth; you shall meditate on it day and night, so that you may be careful to act in accordance with all that is written in it. For then you shall make your way prosperous, and then you shall be successful.

New American Bible
Do not let this book of the law depart from your lips. Recite it by day and by night, that you may carefully observe all that is written in it; then you will attain your goal; then you will succeed.

Douay-Rheims Bible
Let not the book of this law depart from thy mouth: but thou shalt meditate on it day and night, that thou mayst observe and do all things that are written in it: then shalt thou direct thy way, and understand it.

Let not the book of this law depart from thy mouth: but thou shalt meditate on it day and night, that thou mayst observe and do all things that are written in it: then shalt thou direct thy way, and understand it.

book

Deuteronomy 6:6-9 And these words which I command thee this day, shall be in thy heart: . . .

Deuteronomy 11:18,19 Lay up these words in your hearts and minds, and hang them for a sign on your hands, and place them between your eyes. . . .

Deuteronomy 17:18,19 But after he is raised to the throne of his kingdom, he shall copy out to himself the Deuteronomy of this law in a volume, taking the copy of the priests of the Levitical tribe, . . .

Deuteronomy 30:14 But the word is very nigh unto thee, in thy mouth and in thy heart, that thou mayst do it.

Deuteronomy 31:11 When all Israel come together, to appear in the sight of the Lord thy God in the place which the Lord shall choose, thou shalt read the words of this law before all Israel, in their hearing.

Psalm 37:30,31 The mouth of the just shall meditate wisdom: and his tongue shall speak judgment. . . .

Psalm 40:10 I have not hid thy justice within my heart: I have declared thy truth and thy salvation. I have not concealed thy mercy and thy truth from a great council.

Psalm 119:42,43 So shall I answer them that reproach me in any thing; that I have trusted in thy words. . . .

Isaiah 59:21 This is my covenant with them, saith the Lord: My spirit that is in thee, and my words that I have put in thy mouth, shall not depart out of thy mouth, nor out of the mouth of thy seed, nor out of the mouth of thy seed's seed, saith the Lord, from henceforth and for ever.

Matthew 12:35 A good man out of a good treasure bringeth forth good things: and an evil man out of an evil treasure bringeth forth evil things.

Ephesians 4:29 Let no evil speech proceed from your mouth: but that which is good, to the edification of faith: that it may administer grace to the hearers.

thou shalt

Psalm 1:2,3 But his will is in the law of the Lord, and on his law he shall meditate day and night. . . .

Psalm 19:14 And the words of my mouth shall be such as may please: and the meditation of my heart always in thy sight. O Lord, my helper and my Redeemer.

Psalm 119:11,15,97,99 Thy words have I hidden in my heart, that I may not sin against thee. . . .

Proverbs 2:1-5 That thy ear may hearken to wisdom: incline thy heart to know prudence. . . .

Proverbs 3:1 For they shall add to thee length of days, and years of life, and peace.

Colossians 3:16 Let the word of Christ dwell in you abundantly: in all wisdom, teaching and admonishing one another in psalms, hymns and spiritual canticles, singing in grace in your hearts to God.

1 Timothy 4:14-16 Neglect not the grace that is in thee, which was given thee by prophecy, with imposition of the hands of the priesthood. . . .

observe

Deuteronomy 5:29,32,33 Who shall give them to have such a mind, to fear me, and to keep all my commandments at all times, that it may be well with them and with their children for ever? . . .

Deuteronomy 6:1-3 These are the precepts, and ceremonies, and judgments, which the Lord your God commanded that I should teach you, and that you should do them in the land into which you pass over to possess it: . . .

Matthew 7:21,24 Not every one that saith to me, Lord, Lord, shall enter into the kingdom of heaven: but he that doth the will of my Father who is in heaven, he shall enter into the kingdom of heaven. . . .

Matthew 28:20 Teaching them to observe all things whatsoever I have commanded you. And behold I am with you all days, even to the consummation of the world.

Luke 11:28 But he said: Yea rather, blessed are they who hear the word of God and keep it.

John 13:17 If you know these things, you shall be blessed if you do them.

John 14:21 He that hath my commandments and keepeth them; he it is that loveth me. And he that loveth me shall be loved of my Father: and I will love him and will manifest myself to him.

James 1:22-25 But be ye doers of the word and not hearers only, deceiving your own selves. . . .

Revelation 22:14 Blessed are they that wash their robes in the blood of the Lamb: that they may have a right to the tree of life and may enter in by the gates into the city.

have good success.

Joshua 1:7 Take courage therefore, and be very valiant: that thou mayst observe and do all the law, which Moses my servant hath commanded thee: turn not from it to the right hand or to the left, that thou mayst understand all things which thou dost.