Deuteronomy 31:2-8

2And he said to them, I am an hundred and twenty years old this day; I can no more go out and come in: also the LORD hath said to me, Thou shalt not go over this Jordan. 3The LORD thy God, he will go over before thee, and he will destroy these nations from before thee, and thou shalt possess them: and Joshua, he shall go over before thee, as the LORD hath said. 4And the LORD shall do to them as he did to Sihon and to Og, kings of the Amorites, and to the land of them, whom he destroyed. 5And the LORD shall give them up before your face, that ye may do to them according to all the commandments which I have commanded you. 6Be strong and of a good courage, fear not, nor be afraid of them: for the LORD thy God, he it is that doth go with thee; he will not fail thee, nor forsake thee. 7And Moses called to Joshua, and said to him in the sight of all Israel, Be strong and of a good courage: for thou must go with this people to the land which the LORD hath sworn to their fathers to give them; and thou shalt cause them to inherit it. 8And the LORD, he it is that doth go before thee; he will be with thee, he will not fail thee, neither forsake thee: fear not, neither be dismayed.