Joshua 1:7

Above all things, be strong and harden thyself, to observe and to do according to all the laws which Moses my servant commanded thee. Turn there from neither to the righthand, nor to the left: that thou mayest have understanding in all thou takest in hand.

Deuteronomy 5:32

Take heed therefore that ye do as the LORD your God hath commanded you, and turn not aside: either to the righthand or to the left:

Deuteronomy 28:14

And see that thou bow not from any of these words which I command thee this day, either to the righthand or to the left, that thou wouldest go after strange gods to serve them.

Joshua 11:15

and had left no breath remaining. As the LORD commanded Joshua, and even so did Joshua: and diminished no word of all that the LORD commanded Moses.

Deuteronomy 29:9

Keep therefore the words of this covenant and do them, that ye may understand all that ye ought to do.

Numbers 27:23

and put his hands upon him and give him a charge, as the LORD commanded through the hand of Moses.

Deuteronomy 12:32

But whatsoever I command you, that take heed ye do: and put nought thereto, nor take ought therefrom.

Deuteronomy 31:7

And Moses called unto Joshua, and said unto him in the sight of all Israel, "Be strong and bold, for thou must go with this people unto the land which the LORD hath sworn unto their fathers to give them, and thou shalt give it them to inherit.

Joshua 1:1

After the death of Moses, the servant of the LORD, the LORD spake unto Joshua the son of Nun, Moses' minister, saying,

Joshua 1:8

Let not the book of this law depart out of thy mouth: but record therein day and night that thou mayest be circumspect to do according to all that is written therein. For then shalt thou make thy way prosperous, and then thou shalt have understanding.

1 Kings 2:3

And see that thou keep the appointment of the LORD thy God, that thou walk in his ways and keep his commandments, ordinances, laws and testimonies, even as it is written in the law of Moses: that thou mayest understand all that thou oughtest to do, and all that thou shouldest meddle with.

1 Chronicles 22:13

For then thou shalt prosper: If thou shalt be diligent to do the ordinances and laws which the LORD charged Moses with, to deliver to Israel. Pluck up thine heart and be strong, dread not, nor be discouraged.

Proverbs 4:27

Turn not aside, neither to the righthand nor to the left; but withhold thy foot from evil.

Proverbs 8:20

I walk in the way of righteousness, and in the street of judgment:

Treasury of Scripture Knowledge

Summary

Only be thou strong and very courageous, that thou mayest observe to do according to all the law, which Moses my servant commanded thee: turn not from it to the right hand or to the left, that thou mayest prosper whithersoever thou goest.

Bible References

Which moses

Joshua 1:1
After the death of Moses, the servant of the LORD, the LORD spake unto Joshua the son of Nun, Moses' minister, saying,
Joshua 11:15
and had left no breath remaining. As the LORD commanded Joshua, and even so did Joshua: and diminished no word of all that the LORD commanded Moses.
Numbers 27:23
and put his hands upon him and give him a charge, as the LORD commanded through the hand of Moses.
Deuteronomy 31:7
And Moses called unto Joshua, and said unto him in the sight of all Israel, "Be strong and bold, for thou must go with this people unto the land which the LORD hath sworn unto their fathers to give them, and thou shalt give it them to inherit.

Turn not

Deuteronomy 5:32
Take heed therefore that ye do as the LORD your God hath commanded you, and turn not aside: either to the righthand or to the left:
Deuteronomy 12:32
But whatsoever I command you, that take heed ye do: and put nought thereto, nor take ought therefrom.
Deuteronomy 28:14
And see that thou bow not from any of these words which I command thee this day, either to the righthand or to the left, that thou wouldest go after strange gods to serve them.
Proverbs 4:27
Turn not aside, neither to the righthand nor to the left; but withhold thy foot from evil.
Proverbs 8:20
I walk in the way of righteousness, and in the street of judgment:

That

Deuteronomy 29:9
Keep therefore the words of this covenant and do them, that ye may understand all that ye ought to do.
1 Kings 2:3
And see that thou keep the appointment of the LORD thy God, that thou walk in his ways and keep his commandments, ordinances, laws and testimonies, even as it is written in the law of Moses: that thou mayest understand all that thou oughtest to do, and all that thou shouldest meddle with.
1 Chronicles 22:13
For then thou shalt prosper: If thou shalt be diligent to do the ordinances and laws which the LORD charged Moses with, to deliver to Israel. Pluck up thine heart and be strong, dread not, nor be discouraged.

General references

Deuteronomy 4:2
Ye shall put nothing unto the word which I command you, neither do ought therefrom, that ye may keep the commandments of the LORD your God which I command you.
Deuteronomy 15:5
so that thou hearken unto the voice of the LORD thy God, to observe and do all these commandments which I command you this day.
Deuteronomy 29:9
Keep therefore the words of this covenant and do them, that ye may understand all that ye ought to do.
Joshua 10:8
and the LORD said unto Joshua, fear them not, for I have delivered them unto thine hand, there shall not a man of them stand before thee.
Psalm 119:4
Thou hast given straight charge to keep thy commandments: