John Gill

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 Jos 1:6; See Gill on Jos 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 Jos 1:5.