Numbers 32:32
We will pass over armed before the Lord into the land of Canaan, that the possession of our inheritance on this side Jordan may be ours.
Cross-reference
Numbers 32:19
Parallel
Numbers 32:19 states the tribes' inheritance is east of Jordan, directly complementing their pledge to cross over armed here.
Numbers 34:15
Parallel
Numbers 34:15 confirms the two and a half tribes received their inheritance east of Jordan, fulfilling the agreement here.