Numbers 21:15

21:15 And at the stream of the brooks that goeth down to the dwelling of Ar, and lieth upon the border of Moab.

Numbers 21:28

21:28 For there is a fire gone out of Heshbon, a flame from the city of Sihon: it hath consumed Ar of Moab, [and] the lords of the high places of Arnon.