18 I commanded you at that time, "God, your God, has given you this land to possess. Your men, fit and armed for the fight, are to cross the river in advance of their brothers, the People of Israel.

Matthew Henry's Commentary on Deuteronomy 3:18

Commentary on Deuteronomy 3:12-20

(Read Deuteronomy 3:12-20)

This country was settled on the Reubenites, Gadites, and half the tribe of Manasseh: see Numbers 32. Moses repeats the condition of the grant to which they agreed. When at rest, we should desire to see our brethren at rest too, and should be ready to do what we can towards it; for we are not born for ourselves, but are members one of another.