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 22:4

22:4 So the Moabites said to the elders of Midian, “Now this mass of people will lick up everything around us, as the bull devours the grass of the field. Now Balak son of Zippor was king of the Moabites at this time.