This is the end of a part of Moses's speech reminding the Israelites of how Yahweh guided them in the wilderness. (See: [[rc://en/ta/man/jit/writing-background]])
The people of Israel were related to the descendants of Moab. Moab was the son of Lot. Lot was the nephew of Abraham. (See: [[rc://en/ta/man/jit/figs-explicit]])