Numbers 21:26

21:26 For Heshbon was the city of King Sihon of the Amorites. Now he had fought against the former king of Moab and had taken all of his land from his control, as far as the Arnon.

Numbers 21:34

21:34 And the Lord said to Moses, “Do not fear him, for I have delivered him and all his people and his land into your hand. You will do to him what you did to King Sihon of the Amorites, who lived in Heshbon.

Numbers 32:33

Land Assignment

32:33 So Moses gave to the Gadites, the Reubenites, and to half the tribe of Manasseh son of Joseph the realm of King Sihon of the Amorites, and the realm of King Og of Bashan, the entire land with its cities and the territory surrounding them.