Deuteronomy 31:3-6 (NKJV)
3 The Lord your God Himself crosses over before you; He will destroy these nations from before you, and you shall dispossess them. Joshua himself crosses over before you, just as the Lord has said.
4 And the Lord will do to them as He did to Sihon and Og, the kings of the Amorites and their land, when He destroyed them.
5 The Lord will give them over to you, that you may do to them according to every commandment which I have commanded you.
6 Be strong and of good courage, do not fear nor be afraid of them; for the Lord your God, He is the One who goes with you. He will not leave you nor forsake you.