Numbers 21:13-15

CLV(i) 13 From there they journeyed and encamped across the Arnon, which is in the wilderness going forth from the boundary of the Amorite, (for the Arnon is the boundary of Moab between Moab and the Amorite. 14 Therefore it is said in the Scroll of the Wars of Yahweh:The gushing river at the terminus! And the watercourses of Arnon! 15 The slope of the watercourses which stretches out to the seat of Ar, and leans to the boundary of Moab,.