Deuteronomy 31:1-6

Then Moses went out and spoke these words to all Israel: “I am now a hundred and twenty years old and I am no longer able to lead you. The LORD has said to me, ‘You shall not cross the Jordan.’ The LORD your God himself will cross over ahead of you. He will destroy these nations before you, and you will take possession of their land. Joshua also will cross over ahead of you, as the LORD said. And the LORD will do to them what he did to Sihon and Og, the kings of the Amorites, whom he destroyed along with their land. The LORD will deliver them to you, and you must do to them all that I have commanded you. Be strong and courageous. Do not be afraid or terrified because of them, for the LORD your God goes with you; he will never leave you nor forsake you.”