Rise ye up, take your journey, and pass over the river Arnon,.... Which was on the border of Moab, and divided between Moab and the Amorites, Num 21:13. behold, I have given into thy hand Sihon, the Amorite, king of Heshbon, and his land; that is, he had determined to give it to the Israelites, for as yet it was not actually given; of this king, and the place he was king of; see Gill on Num 21:21, Num 21:26 begin to possess it, and contend with him in battle; provoke him to war, fight with him, take his land from him, and enter upon the possession of it, hereby assuring of victory.