Joshua 1:7

Only be strong and very courageous, that you may observe to do according to all the law, which Moses my servant commanded you: turn not from it to the right hand or to the left, that you may prosper wherever you go.

Deuteronomy 5:32

You shall observe to do therefore as the LORD your God has commanded you: you shall not turn aside to the right hand or to the left.

Deuteronomy 28:14

And you shall not go aside from any of the words which I command you this day, to the right hand, or to the left, to go after other gods to serve them.

Joshua 11:15

As the LORD commanded Moses his servant, so did Moses command Joshua, and so did Joshua; he left nothing undone of all that the LORD commanded Moses.

Deuteronomy 29:9

Keep therefore the words of this covenant, and do them, that you may prosper in all that you do.

Numbers 27:23

And he laid his hands upon him, and gave him a charge, as the LORD commanded by the hand of Moses.

Deuteronomy 12:32

Whatsoever thing I command you, observe to do it: you shall not add thereto, nor take away from it.

Deuteronomy 31:7

And Moses called unto Joshua, and said unto him in the sight of all Israel, Be strong and of a good courage: for you must go with this people unto the land which the LORD has sworn unto their fathers to give them; and you shall cause them to inherit it.

Joshua 1:1

Now after the death of Moses the servant of the LORD it came to pass, that the LORD spoke unto Joshua the son of Nun, Moses' minister, saying,

Joshua 1:8

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

1 Kings 2:3

And keep the charge of the LORD your God, to walk in his ways, to keep his statutes, and his commandments, and his judgments, and his testimonies, as it is written in the law of Moses, that you may prosper in all that you do, and wherever you turn yourself:

1 Chronicles 22:13

Then shall you prosper, if you take heed to fulfill the statutes and judgments which the LORD charged Moses with concerning Israel: be strong, and of good courage; dread not, nor be dismayed.

Proverbs 4:27

Turn not to the right hand nor to the left: remove your foot from evil.

Proverbs 8:20

I lead in the way of righteousness, in the midst of the paths of justice:

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
Now after the death of Moses the servant of the LORD it came to pass, that the LORD spoke unto Joshua the son of Nun, Moses' minister, saying,
Joshua 11:15
As the LORD commanded Moses his servant, so did Moses command Joshua, and so did Joshua; he left nothing undone of all that the LORD commanded Moses.
Numbers 27:23
And he laid his hands upon him, and gave him a charge, as the LORD commanded by 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 of a good courage: for you must go with this people unto the land which the LORD has sworn unto their fathers to give them; and you shall cause them to inherit it.

Turn not

Deuteronomy 5:32
You shall observe to do therefore as the LORD your God has commanded you: you shall not turn aside to the right hand or to the left.
Deuteronomy 12:32
Whatsoever thing I command you, observe to do it: you shall not add thereto, nor take away from it.
Deuteronomy 28:14
And you shall not go aside from any of the words which I command you this day, to the right hand, or to the left, to go after other gods to serve them.
Proverbs 4:27
Turn not to the right hand nor to the left: remove your foot from evil.
Proverbs 8:20
I lead in the way of righteousness, in the midst of the paths of justice:

That

Deuteronomy 29:9
Keep therefore the words of this covenant, and do them, that you may prosper in all that you do.
1 Kings 2:3
And keep the charge of the LORD your God, to walk in his ways, to keep his statutes, and his commandments, and his judgments, and his testimonies, as it is written in the law of Moses, that you may prosper in all that you do, and wherever you turn yourself:
1 Chronicles 22:13
Then shall you prosper, if you take heed to fulfill the statutes and judgments which the LORD charged Moses with concerning Israel: be strong, and of good courage; dread not, nor be dismayed.

General references

Deuteronomy 4:2
You shall not add unto the word which I command you, neither shall you take away from it, that you may keep the commandments of the LORD your God which I command you.
Deuteronomy 15:5
Only if you carefully hearken unto the voice of the LORD your God, to observe to do all these commandments which I command you this day.
Deuteronomy 29:9
Keep therefore the words of this covenant, and do them, that you may prosper in all that you do.
Joshua 10:8
And the LORD said unto Joshua, Fear them not: for I have delivered them into your hand; there shall not a man of them stand before you.
Psalm 119:4
You have commanded us to keep your precepts diligently.