23 Sihon would not allow Israel to pass through his border, but Sihon gathered all his people together, and went out against Israel into the wilderness, and came to Jahaz. He fought against Israel.
Numbers 21:23 Cross References - WEB
Numbers 20:21
21 Thus Edom refused to give Israel passage through his border, so Israel turned away from him.
Deuteronomy 2:30-32
30 But Sihon king of Heshbon would not let us pass by him; for Yahweh your God hardened his spirit and made his heart obstinate, that he might deliver him into your hand, as it is today.
31 Yahweh said to me, “Behold, I have begun to deliver up Sihon and his land before you. Begin to possess, that you may inherit his land.”
32 Then Sihon came out against us, he and all his people, to battle at Jahaz.
Deuteronomy 29:7-8
Judges 11:20
20 But Sihon didn’t trust Israel to pass through his border; but Sihon gathered all his people together, and encamped in Jahaz, and fought against Israel.
Isaiah 15:4
4 Heshbon cries out with Elealeh. Their voice is heard even to Jahaz. Therefore the armed men of Moab cry aloud. Their souls tremble within them.
Jeremiah 48:34
34 From the cry of Heshbon even to Elealeh, even to Jahaz they have uttered their voice, from Zoar even to Horonaim, to Eglath Shelishiyah; for the waters of Nimrim will also become desolate.