Deuteronomy 31:3-8

The LORD your God himself will go over before you. He will destroy these nations before you, so that you shall dispossess them, and Joshua will go over at your head, as the LORD has spoken. And the LORD will do to them as he did to Sihon and Og, the kings of the Amorites, and to their land, when he destroyed them. And the LORD will give them over to you, and you shall do to them according to the whole commandment that I have commanded you. Be strong and courageous. Do not fear or be in dread of them, for it is the LORD your God who goes with you. He will not leave you or forsake you.” Then Moses summoned Joshua and said to him in the sight of all Israel, “Be strong and courageous, for you shall go with this people into the land that the LORD has sworn to their fathers to give them, and you shall put them in possession of it. It is the LORD who goes before you. He will be with you; he will not leave you or forsake you. Do not fear or be dismayed.”