 The Midrash explained that the same was true of Sihon, as all the kings of Canaan paid Sihon money from their taxes, since Sihon appointed them as kings.The Midrash interpreted which says, "Sihon king of the Amorites, and Og king of Bashan, and all the kingdoms of Canaan," to teach that Sihon and Og were the equal of all the other kings of Canaan.So the Israelites asked Sihon to let them pass through Sihon's land to conquer the kings of Canaan, and Sihon replied that the sole reason that he was there was to protect the kings of Canaan from the Israelites.