Deuteronomy 31:6 says the LORD goes with His people and will never leave them nor do what?

Answer: Forsake them

Moses told Israel, "Be strong and courageous... He will never leave you nor forsake you" (KJV: "he will not fail thee, nor forsake thee").

“Be strong and courageous; do not be afraid or terrified of them, for it is the LORD your God who goes with you; He will never leave you nor forsake you.””— Deuteronomy 31:6 (BSB)