1 Kings 4:19

Geber the son of Uri was in the country of Gilead, in the country of Sihon king of the Amorites, and of Og king of Bashan; and he was the only officer which was in the land.

Cross-reference

Numbers 21:21-35 recounts Israel's conquest of Sihon and Og — the very land later governed by Geber here.

Deuteronomy 2:26-37 describes the conquest of Sihon, whose territory is mentioned here as part of Geber's district.

Deuteronomy 3:1-17 recounts the conquest of Og, whose land is listed here among Geber's jurisdiction.

Joshua 13:9-12 details the allotment of Sihon and Og's territory, which matches the region governed by Geber here.