Joshua 1:8

the book of this law doth not depart out of thy mouth, and thou hast meditated in it by day and by night, so that thou dost observe to do according to all that is written in it, for then thou dost cause thy way to prosper, and then thou dost act wisely.

Psalm 19:14

Let the sayings of my mouth, And the meditation of my heart, Be for a pleasing thing before Thee, O Jehovah, my rock, and my redeemer!

Psalm 119:15

In Thy precepts I meditate, And I behold attentively Thy paths.

Deuteronomy 5:29

O that their heart had been thus to them, to fear Me, and to keep My commands all the days, that it may be well with them, and with their sons -- to the age!

Deuteronomy 5:32-3

And ye have observed to do as Jehovah your God hath commanded you, ye turn not aside -- right or left;

Deuteronomy 6:6-9

and these words which I am commanding thee to-day have been on thine heart,

Deuteronomy 11:18-19

'And ye have placed these my words on your heart, and on your soul, and have bound them for a sign on your hand, and they have been for frontlets between your eyes;

Deuteronomy 17:18-19

And it hath been, when he sitteth on the throne of his kingdom, that he hath written for himself the copy of this law, on a book, from that before the priests the Levites,

Deuteronomy 29:9

and ye have kept the words of this covenant, and done them, so that ye cause all that ye do to prosper.

Deuteronomy 30:14

For very near unto thee is the word, in thy mouth, and in thy heart -- to do it.

Deuteronomy 31:11

in the coming in of all Israel to see the face of Jehovah in the place which He chooseth, thou dost proclaim this law before all Israel, in their ears.

Joshua 1:7

Only, be strong and very courageous, to observe to do according to all the law which Moses My servant commanded thee; thou dost not turn aside from it right or left, so that thou dost act wisely in every place whither thou goest;

Psalm 1:1-3

O the happiness of that one, who Hath not walked in the counsel of the wicked. And in the way of sinners hath not stood, And in the seat of scorners hath not sat;

Psalm 37:30-31

The mouth of the righteous uttereth wisdom, And his tongue speaketh judgment.

Psalm 40:10

Thy righteousness I have not concealed In the midst of my heart, Thy faithfulness and Thy salvation I have told, I have not hidden Thy kindness and Thy truth, To the great assembly.

Psalm 119:11

In my heart I have hid Thy saying, That I sin not before Thee.

Psalm 119:42-43

And I answer him who is reproaching me a word, For I have trusted in Thy word.

Psalm 119:97

Mem. O how I have loved Thy law! All the day it is my meditation.

Psalm 119:99

Above all my teachers I have acted wisely. For Thy testimonies are my meditation.

Proverbs 2:1-5

My son, if thou dost accept my sayings, And my commands dost lay up with thee,

Proverbs 3:1

My son! my law forget not, And my commands let thy heart keep,

Isaiah 59:21

And I -- this is My covenant with them, said Jehovah, My Spirit that is on thee, And My words that I have put in thy mouth, Depart not from thy mouth, And from the mouth of thy seed, And from the mouth of thy seed's seed, said Jehovah, From henceforth unto the age!

Matthew 7:21

'Not every one who is saying to me Lord, lord, shall come into the reign of the heavens; but he who is doing the will of my Father who is in the heavens.

Matthew 7:24

'Therefore, every one who doth hear of me these words, and doth do them, I will liken him to a wise man who built his house upon the rock;

Matthew 12:35

The good man out of the good treasure of the heart doth put forth the good things, and the evil man out of the evil treasure doth put forth evil things.

Matthew 28:20

teaching them to observe all, whatever I did command you,) and lo, I am with you all the days -- till the full end of the age.'

Luke 11:28

And he said, 'Yea, rather, happy those hearing the word of God, and keeping it!'

John 13:17

if these things ye have known, happy are ye, if ye may do them;

John 14:21

he who is having my commands, and is keeping them, that one it is who is loving me, and he who is loving me shall be loved by my Father, and I will love him, and will manifest myself to him.'

Ephesians 4:29

Let no corrupt word out of your mouth go forth, but what is good unto the needful building up, that it may give grace to the hearers;

Colossians 3:16

Let the word of Christ dwell in you richly, in all wisdom, teaching and admonishing each other, in psalms, and hymns, and spiritual songs, in grace singing in your hearts to the Lord;

1 Timothy 4:14-16

be not careless of the gift in thee, that was given thee through prophecy, with laying on of the hands of the eldership;

James 1:22-25

and become ye doers of the word, and not hearers only, deceiving yourselves,

Revelation 22:14

'Happy are those doing His commands that the authority shall be theirs unto the tree of the life, and by the gates they may enter into the city;

Treasury of Scripture Knowledge

Summary

This book of the law shall not depart out of thy mouth; but thou shalt meditate therein day and night, that thou mayest observe to do according to all that is written therein: for then thou shalt make thy way prosperous, and then thou shalt have good success.

Bible References

Book

Deuteronomy 6:6
and these words which I am commanding thee to-day have been on thine heart,
Deuteronomy 11:18
'And ye have placed these my words on your heart, and on your soul, and have bound them for a sign on your hand, and they have been for frontlets between your eyes;
Deuteronomy 17:18
And it hath been, when he sitteth on the throne of his kingdom, that he hath written for himself the copy of this law, on a book, from that before the priests the Levites,
Deuteronomy 30:14
For very near unto thee is the word, in thy mouth, and in thy heart -- to do it.
Deuteronomy 31:11
in the coming in of all Israel to see the face of Jehovah in the place which He chooseth, thou dost proclaim this law before all Israel, in their ears.
Psalm 37:30
The mouth of the righteous uttereth wisdom, And his tongue speaketh judgment.
Psalm 40:10
Thy righteousness I have not concealed In the midst of my heart, Thy faithfulness and Thy salvation I have told, I have not hidden Thy kindness and Thy truth, To the great assembly.
Psalm 119:42
And I answer him who is reproaching me a word, For I have trusted in Thy word.
Isaiah 59:21
And I -- this is My covenant with them, said Jehovah, My Spirit that is on thee, And My words that I have put in thy mouth, Depart not from thy mouth, And from the mouth of thy seed, And from the mouth of thy seed's seed, said Jehovah, From henceforth unto the age!
Matthew 12:35
The good man out of the good treasure of the heart doth put forth the good things, and the evil man out of the evil treasure doth put forth evil things.
Ephesians 4:29
Let no corrupt word out of your mouth go forth, but what is good unto the needful building up, that it may give grace to the hearers;

Thou shalt

Psalm 1:2
But -- in the law of Jehovah is his delight, And in His law he doth meditate by day and by night:
Psalm 19:14
Let the sayings of my mouth, And the meditation of my heart, Be for a pleasing thing before Thee, O Jehovah, my rock, and my redeemer!
Psalm 119:11
In my heart I have hid Thy saying, That I sin not before Thee.
Proverbs 2:1
My son, if thou dost accept my sayings, And my commands dost lay up with thee,
Proverbs 3:1
My son! my law forget not, And my commands let thy heart keep,
Colossians 3:16
Let the word of Christ dwell in you richly, in all wisdom, teaching and admonishing each other, in psalms, and hymns, and spiritual songs, in grace singing in your hearts to the Lord;
1 Timothy 4:14
be not careless of the gift in thee, that was given thee through prophecy, with laying on of the hands of the eldership;

Observe

Deuteronomy 5:29
O that their heart had been thus to them, to fear Me, and to keep My commands all the days, that it may be well with them, and with their sons -- to the age!
Deuteronomy 6:1
And this is the command, the statutes and the judgments which Jehovah your God hath commanded to teach you, to do in the land which ye are passing over thither to possess it,
Matthew 7:21
'Not every one who is saying to me Lord, lord, shall come into the reign of the heavens; but he who is doing the will of my Father who is in the heavens.
Matthew 28:20
teaching them to observe all, whatever I did command you,) and lo, I am with you all the days -- till the full end of the age.'
Luke 11:28
And he said, 'Yea, rather, happy those hearing the word of God, and keeping it!'
John 13:17
if these things ye have known, happy are ye, if ye may do them;
John 14:21
he who is having my commands, and is keeping them, that one it is who is loving me, and he who is loving me shall be loved by my Father, and I will love him, and will manifest myself to him.'
James 1:22
and become ye doers of the word, and not hearers only, deceiving yourselves,
Revelation 22:14
'Happy are those doing His commands that the authority shall be theirs unto the tree of the life, and by the gates they may enter into the city;

General references

Deuteronomy 17:19
and it hath been with him, and he hath read in it all days of his life, so that he doth learn to fear Jehovah his God, to keep all the words of this law, and these statutes, to do them;
Joshua 10:8
And Jehovah saith unto Joshua, 'Be not afraid of them, for into thy hand I have given them, there doth not stand a man of them in thy presence.'
Isaiah 48:15
I -- I have spoken, yea, I have called him, I have brought him in, And he hath made prosperous his way.