Sihon in the Bible

(King of the Amorites) His seat of government at Heshbon

Numbers 21:26 For Heshbon was the city of Sihon the king of the Amorites, who had fought against the former king of Moab, and taken all his land out of his hand, even unto Arnon.

⇒Bible Encyclopedia for SIHON.

The proverbial chant celebrating the victory of Sihon over the Moabites

Numbers 21:26-30 For Heshbon was the city of Sihon the king of the Amorites, who had fought against the former king of Moab, and taken all his land out of his hand, even unto Arnon. 27 Wherefore they that speak in proverbs say, Come into Heshbon, let the city of Sihon be built and prepared: 28 For there is a fire gone out of Heshbon, a flame from the city of Sihon: it hath consumed Ar of Moab, and the lords of the high places of Arnon. 29 Woe to thee, Moab! thou art undone, O people of Chemosh: he hath given his sons that escaped, and his daughters, into captivity unto Sihon king of the Amorites. ...

Conquest of his kingdom by the Israelites

Numbers 21:21-25 And Israel sent messengers unto Sihon king of the Amorites, saying, 22 Let me pass through thy land: we will not turn into the fields, or into the vineyards; we will not drink of the waters of the well: but we will go along by the king's high way, until we be past thy borders. 23 And Sihon would not suffer Israel to pass through his border: but Sihon gathered all his people together, and went out against Israel into the wilderness: and he came to Jahaz, and fought against Israel. 24 And Israel smote him with the edge of the sword, and possessed his land from Arnon unto Jabbok, even unto the children of Ammon: for the border of the children of Ammon was strong. ...
Deuteronomy 2:24-37 Rise ye up, take your journey, and pass over the river Arnon: behold, I have given into thine hand Sihon the Amorite, king of Heshbon, and his land: begin to possess it, and contend with him in battle. 25 This day will I begin to put the dread of thee and the fear of thee upon the nations that are under the whole heaven, who shall hear report of thee, and shall tremble, and be in anguish because of thee. 26 And I sent messengers out of the wilderness of Kedemoth unto Sihon king of Heshbon with words of peace, saying, 27 Let me pass through thy land: I will go along by the high way, I will neither turn unto the right hand nor to the left. ...
Deuteronomy 3:2 And the LORD said unto me, Fear him not: for I will deliver him, and all his people, and his land, into thy hand; and thou shalt do unto him as thou didst unto Sihon king of the Amorites, which dwelt at Heshbon.
Deuteronomy 3:6 And we utterly destroyed them, as we did unto Sihon king of Heshbon, utterly destroying the men, women, and children, of every city.
Deuteronomy 3:8 And we took at that time out of the hand of the two kings of the Amorites the land that was on this side Jordan, from the river of Arnon unto mount Hermon;