Joshua 1:7

Only be strong and very courageous so that you may be careful to do according to all the Law which My servant Moses commanded you. Do not turn from it to the right or to the left, so that you may act wisely wherever you go.

Deuteronomy 5:32

And you shall be careful to do as Jehovah 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 today, to the right hand or the left, to go after other gods to serve them.

Joshua 11:15

As Jehovah commanded Moses His servant, so did Moses command Joshua, and so Joshua did. He left nothing undone of all that Jehovah commanded Moses.

Deuteronomy 29:9

Therefore, keep the words of this covenant and do them, so that you may act wisely in all that you do.

Numbers 27:23

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

Deuteronomy 12:32

All the things I command you, be careful to do it. You shall not add to it, nor take away from it.

Deuteronomy 31:7

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

Joshua 1:1

And it happened after the death of Moses the servant of Jehovah, Jehovah spoke to 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 on it by day and by night, so that you may be careful to do according to all that is written in it. For then you shall make your way prosperous, and then you shall act wisely.

1 Kings 2:3

And keep the charge of Jehovah 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, so that you may prosper in all that you do and wherever you turn yourself,

1 Chronicles 22:13

Then you shall prosper, if you take heed to fulfil the statutes and judgments with which Jehovah charged Moses, concerning Israel. Be strong and of good courage. Do not fear, nor be dismayed.

Proverbs 4:27

Do not turn 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 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
And it happened after the death of Moses the servant of Jehovah, Jehovah spoke to Joshua the son of Nun, Moses' minister, saying,
Joshua 11:15
As Jehovah commanded Moses His servant, so did Moses command Joshua, and so Joshua did. He left nothing undone of all that Jehovah commanded Moses.
Numbers 27:23
And he laid his hands upon him and gave him a charge, even as Jehovah commanded by the hand of Moses.
Deuteronomy 31:7
And Moses called to Joshua and said to him in the sight of all Israel, Be strong and of a good courage. For you must go with this people to the land which Jehovah has sworn to their fathers to give it to them, and you shall cause them to inherit it.

Turn not

Deuteronomy 5:32
And you shall be careful to do as Jehovah your God has commanded you. You shall not turn aside to the right hand or to the left.
Deuteronomy 12:32
All the things I command you, be careful to do it. You shall not add to it, nor take away from it.
Deuteronomy 28:14
And you shall not go aside from any of the words which I command you today, to the right hand or the left, to go after other gods to serve them.
Proverbs 4:27
Do not turn 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 judgment;

That

Deuteronomy 29:9
Therefore, keep the words of this covenant and do them, so that you may act wisely in all that you do.
1 Kings 2:3
And keep the charge of Jehovah 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, so that you may prosper in all that you do and wherever you turn yourself,
1 Chronicles 22:13
Then you shall prosper, if you take heed to fulfil the statutes and judgments with which Jehovah charged Moses, concerning Israel. Be strong and of good courage. Do not fear, nor be dismayed.

General references

Deuteronomy 4:2
You shall not add to the Word which I command you, neither shall you take away from it, so that you may keep the commands of Jehovah your God which I command you.
Deuteronomy 15:5
only if you carefully listen to the voice of Jehovah your God to be careful to do all these commandments which I command you today.
Deuteronomy 29:9
Therefore, keep the words of this covenant and do them, so that you may act wisely in all that you do.
Joshua 10:8
And Jehovah said to Joshua, Do not fear them, for I have delivered them into your hands. There shall not a man of them stand before you.
Psalm 119:4
You have commanded us to keep Your Commandments carefully.