New Revised Standard Version
Only be strong and very courageous, being careful to act in accordance with all the law that my servant Moses commanded you; do not turn from it to the right hand or to the left, so that you may be successful wherever you go.

New American Bible
Only be strong and steadfast, being careful to observe the entire law which Moses my servant enjoined on you. Do not swerve from it either to the right or to the left, that you may succeed wherever you go.

Douay-Rheims Bible
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.

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.

which Moses

Joshua 1:1 Now it came to pass after the death of Moses, the servant of the Lord, that the Lord spoke to Joshua, the son of Nun, the minister of Moses, and said to him:

Joshua 11:15 As the Lord had commanded Moses his servant, so did Moses command Joshua, and he accomplished all: he left not one thing undone of all the commandments which the Lord had commanded Moses.

Numbers 27:23 And laying his hands on his head, he repeated all things that the Lord had commanded.

Deuteronomy 31:7 And Moses called Josue, and said to him before all Israel: Take courage, and be valiant: for thou shalt bring this people into the land which the Lord swore he would give to their fathers, and thou shalt divide it by lot.

turn not

Deuteronomy 5:32 Keep therefore and do the things which the Lord God hath commanded you: you shall not go aside neither to the right hand, nor to the left.

Deuteronomy 12:32 What I command thee, that only do thou to the Lord: neither add any thing, nor diminish.

Deuteronomy 28:14 And turn not away from them neither to the right hand, nor to the left, nor follow strange gods, nor worship them.

Proverbs 4:27 My son, attend to my wisdom, and incline thy ear to my prudence,

Proverbs 8:20 That I may enrich them that love me, and may fill their treasures.

that

Deuteronomy 29:9 Keep therefore the words of this covenant, and fulfil them: that you may understand all that you do.

1 Kings 2:3 And keep the charge of the Lord thy God, to walk in his ways, and observe his ceremonies, and his precepts, and judgments, and testimonies, as it is written in the law of Moses: that thou mayst understand all thou dost, and whithersoever thou shalt turn thyself:

1 Chronicles 22:13 For then thou shalt be able to prosper, if thou keep the commandments, and judgments, which the Lord commanded Moses to teach Israel: take courage and act manfully, fear not, nor be dismayed.

prosper.

Joshua 1:8 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.