Deuteronomy 31:2-6

he said, “I am now 120 years old, and I am no longer able to lead you. The LORD has told me, ‘You will not cross the Jordan River.’ But the LORD your God himself will cross over ahead of you. He will destroy the nations living there, and you will take possession of their land. Joshua will lead you across the river, just as the LORD promised. “The LORD will destroy the nations living in the land, just as he destroyed Sihon and Og, the kings of the Amorites. The LORD will hand over to you the people who live there, and you must deal with them as I have commanded you. So be strong and courageous! Do not be afraid and do not panic before them. For the LORD your God will personally go ahead of you. He will neither fail you nor abandon you.”