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.

Only be strong and very courageous, to 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 have good success whithersoever thou goest.

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.

Only be strong and very courageous, that thou mayest take heed to do according to all the law that Moses my servant commanded thee. Turn not from it to the right or to the left, that thou mayest prosper whithersoever thou goest.

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;

Only be you 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.

Only take heart and be very strong; take care to do all the law which Moses my servant gave you, not turning from it to the right hand or to the left, so that you may do well in all your undertakings.

Therefore, be strengthened and be very steadfast, so that you may observe and accomplish the entire law, which Moses, my servant, instructed to you. You may not turn aside from it to the right, nor to the left. So may you understand all that you should do.

Tantum confirmare et roborare vehementer: ut custodias et facias secundum totam legem quam praecepit tibi Moses servus meus; non recedes ad dextram vel ad sinistram ut prudenter (vel prospere) agas in omnibus.

Prosper - See the margin. The literal rendering should be retained here since the notion of prosperity is separately introduced by a different word in Joshua 1:8.

Only be thou strong, and very courageous - Ισχυε ουν, και ανδριζου σφοδρα. - Sept. Be strong therefore, and play the man to the uttermost. Though God had promised him that no man should be able to stand before him, yet it was on condition that he should use all his military skill, and avail himself to the uttermost of all the means, natural and providential, which God should place within his reach. God will not have them who refuse to help themselves.

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 (e) prosper whithersoever thou goest.
(e) He shows where true prosperity consists, even to obey the word of God.

Only be thou strong, and very courageous,.... For though Joshua was a man of valour and courage, as appears by his war with Amalek, yet there was need of this exhortation, and of repeating it, since he was to engage with a people more and mightier than those with him, and who dwelt in strong and fortified places, and had been preparing for some time, having had notice, and were in expectation of the Israelites' attempt upon them:
that thou mayest observe to do according to all the law which Moses my servant commanded thee; not only as a private man obliged to observe the whole law, and act according to it in all things; though no mere man is capable of it, only Joshua's antitype, who is the end of it for righteousness to all that believe, having fulfilled it in all respects; but as the supreme magistrate under God, who was to see that the law was obeyed by the people in all things, and particularly as the general of the army, who was to observe to do what had been ordered, with respect to the Canaanites, see Deuteronomy 7:1,
turn not from it to the right hand or to the left: from the law, by adding to it, or taking from it; so Ben Gersom explains it,"turning to the right hand is, when any adds to its words; and turning to the left hand, when he diminishes from them;''or "from him" (k), that is, from Moses; from his good way, as Kimchi; though he adds, or else from the book of the law; for though he does not mention the book, he does the law; so Ben Melech:
that thou mayest prosper whithersoever thou goest; succeed in every battle he engaged in; it would be well if generals of armies would observe this; the way to obtain victory over enemies being to be observant of the laws of God themselves, and to take care that they be observed by the soldiers under their command: or "that thou mayest act wisely" (l); the word of God furnishing out instruction to men in every station of life, see Luke 3:10.
(k) "ab so", Montanus, Vatablus, Junius & Tremellius. (l) , Sept. "ut intelligas", V. L. Pagninus, Montanus; "ut prudenter agas", Tigurine version.

Commanded thee - Remember, that though thou art the commander of my people, yet thou art my subject, and obliged to observe all my commands. To the right hand or to the left - That is, in any kind, or upon any pretence; which plainly shews, that God's assistance promised to him and the Israelites, was conditional, and might justly be withdrawn upon their breach of the conditions. Whithersoever thou goest - That is, whatsoever thou doest. Mens actions are often compared to ways, or steps by which they come to the end they aim at.