Why Sihon the Canaanite Refused Israel Passage at His Border

"And Sihon would not allow Israel to pass through his border" (Numbers 21:23). He said to them: The whole purpose of the Canaanites — we were hired only so that I would not let you pass. Immediately, "and Sihon gathered" (Numbers 21:23). And why was his name called Sihon? Because he went after speech (sichah). And what was his name? Canaani was his name.