Numbers 21:15

15 and the slope of the valleys that extends to the seat of Ar, and leans to the border of Moab."

Numbers 21:15 Meaning and Commentary

Numbers 21:15

And at the stream of the brooks that goeth down to the
dwelling of Ar
All that part of the country which lay upon the stream, as far as the city of Ar, the metropolis of Moab, called Ar of Moab, ( Isaiah 15:1 ) ,

and lieth upon the border of Moab;
as that city did; so far goes the quotation out of the aforesaid book, as a proof of what was taken by the Amorites from the Moabites, and were not in their possession when Israel were upon their borders; and therefore, in taking them from the Amorites, did no wrong to Moab.

Numbers 21:15 In-Context

13 From there they set out, and encamped on the other side of the Arnon, which is in the wilderness, that extends from the boundary of the Amorites; for the Arnon is the boundary of Moab, between Moab and the Amorites.
14 Wherefore it is said in the Book of the Wars of the LORD, "Waheb in Suphah, and the valleys of the Arnon,
15 and the slope of the valleys that extends to the seat of Ar, and leans to the border of Moab."
16 And from there they continued to Beer; that is the well of which the LORD said to Moses, "Gather the people together, and I will give them water."
17 Then Israel sang this song: "Spring up, O well! --Sing to it! --
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.