Be strong, and of good courage,.... The same exhortation Moses gave him, Deuteronomy 31:7; and is afterwards repeated in this chapter, as being of great moment and importance, as it is in the general of an army to show greatness and strength of mind, valour and courage, and not be dismayed at the number and strength of the enemy. As Joshua's work in fighting with the Canaanites, and conquering their land, so Christ's work in the redemption of his people, and subduing their enemies, required strength and courage, and both were very eminent in him:

for unto this people shalt thou divide for an inheritance the land which I sware unto their fathers to give them; and, this promise included and ensured the conquest of it, and the putting the people into the possession of it; for if he was to divide it to them, he must first take it out of the hands of the present inhabitants, and deliver it into the hands of the children of Israel, to be possessed by them, dividing to each tribe and family their part and portion.

The promise is followed by the condition upon which the Lord would fulfil His word. Joshua was to be firm and strong, i.e., well-assured, courageous, not alarmed (vid., Deuteronomy 31:6). In the first place (Joshua 1:6), he was to rely firmly upon the Lord and His promise, as Moses and the Lord had already told him (Deuteronomy 31:7 and Deuteronomy 31:23), and as is again repeated here, whilst at the same time the expression, "thou shalt divide for an inheritance," recalls to mind Deuteronomy 1:38; Deuteronomy 3:28; and in the second place (Joshua 1:7, Joshua 1:8), he was to strive to attain and preserve this firmness by a careful observance of the law. "Observe to do," etc., as Moses had already impressed upon the hearts of all the people (Deuteronomy 5:29, cf. Deuteronomy 28:14 and Deuteronomy 2:27). The suffix in ממּנּוּ is to be explained on the supposition that the speaker had the book of the law in his mind. The further expansion, in Joshua 1:8, is not only attached to the exhortations, with which Moses urges upon all the people in Deuteronomy 6:6-7, and Deuteronomy 11:18-19, an uninterrupted study and laying to heart of the commandments of God, but even more closely to the directions to the king, to read every day in the law (Deuteronomy 17:19). "Not to depart out of the mouth," is to be constantly in the mouth. The law is in our mouth, not only when we are incessantly preaching it, but when we are reading it intelligently for ourselves, or conversing about it with others. To this there was to be added meditation, or reflection upon it both day and night (vid., Psalm 1:2). הגה does not mean theoretical speculation about the law, such as the Pharisees indulged in, but a practical study of the law, for the purpose of observing it in thought and action, or carrying it out with the heart, the mouth, and the hand. Such a mode of employing it would be sure to be followed by blessings. "Then shalt thou make they way prosperous," i.e., succeed in all thine undertakings (vid., Deuteronomy 28:29), "and act wisely" (as in Deuteronomy 29:8).

Be strong and of a good courage: for unto this people shalt thou divide for an inheritance the land, which I sware unto their fathers to give them.

1:6 Be strong and of a good courage - Joshua, though a person of great courage and resolution, whereof he had given sufficient proof, yet needs these exhortations, partly because his work was great, and difficult, and long, and in a great measure new; partly because he had a very mean opinion of himself, especially if compared with Moses; and remembering how perverse and ungovernable that people were, even under Moses, he might very well suspect the burden of ruling them would be too heavy for his shoulders.

unto this...: or, thou shalt cause this people to inherit the land, etc

1:5-9 Joshua is to make the law of God his rule. He is charged to meditate therein day and night, that he might understand it. Whatever affairs of this world we have to mind, we must not neglect the one thing needful. All his orders to the people, and his judgments, must be according to the law of God. Joshua must himself be under command; no man's dignity or dominion sets him above the law of God. He is to encourage himself with the promise and presence of God. Let not the sense of thine own infirmities dishearten thee; God is all-sufficient. I have commanded, called, and commissioned thee to do it, and will be sure to bear thee out in it. When we are in the way of duty, we have reason to be strong and very bold. Our Lord Jesus, as Joshua here, was borne up under his sufferings by a regard to the will of God, and the commandment from his Father.