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.Have not I commanded thee?.... The above things, to go over Jordan with the people into the land of Canaan, and to observe the law of Moses in all things, and to be of good courage, which is again repeated; consider who it is that has given these orders and instructions, the great Jehovah, the everlasting I AM, who is faithful to his promises, and able to perform. The consideration of which would serve to animate him to the work he was called unto, to encourage his faith in God, to engage in his service cheerfully and readily:

be strong, and of a good courage; See Gill on Joshua 1:6; See Gill on Joshua 1:7.

be not afraid, nor be thou dismayed; at his enemies, numerous and powerful, nor discouraged at anything in himself, any unfitness for such service, as he might think, or at any difficulties he might fear from the people he had the government of, and was to lead on; it was enough that the divine Presence was promised him, and which is repeated:

for the Lord thy God is with thee whithersoever thou goest: or, as the Targum of Jonathan,"for thy help is the Word of the Lord thy God;''See Gill on Joshua 1:5.