Numbers 21:13-15

Young's Literal Translation

¹³ From thence they have journeyed, and encamp beyond Arnon, which [is] in the wilderness which is coming out of the border of the Amorite, for Arnon [is] the border of Moab, between Moab and the Amorite;

¹⁴ therefore it is said in a book, `The wars of Jehovah,' -- `Waheb in Suphah, And the brooks of Arnon;

¹⁵ And the spring of the brooks, Which turned aside to the dwelling of Ar, And hath leaned to the border of Moab.'