Deuteronomy 31:1-8

And Moses went, and spoke all these words to all Israel. And he said to them: I am this day a hundred and twenty years old. I can no longer go out and come in, especially as the Lord also hath said to me: Thou shalt not pass over this Jordan. The Lord thy God then will pass over before thee: he will destroy all these nations in thy sight, and thou shalt possess them. And this Josue shall go over before thee, as the Lord hath spoken. And the Lord shall do to them as he did to Sehon and Og the kings of the Amorrhites, and to their land: and shall destroy them. Therefore when the Lord shall have delivered these also to you, you shall do in like manner to them as I have commanded you. Do manfully and be of good heart: fear not, nor be ye dismayed at their sight. For the Lord thy God he himself is thy leader, and will not leave thee nor forsake thee. 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. And the Lord who is your leader, he himself will be with thee: he will not leave thee, nor forsake thee. Fear not, neither be dismayed.