Numbers 21:15

the slope of the valleys that incline toward the dwelling of Ar, leans on the border of Moab."

Numbers 21:28

for a fire has gone out of Heshbon, a flame from the city of Sihon. It has devoured Ar of Moab, The lords of the high places of the Arnon.

Deuteronomy 2:9

Yahweh said to me, "Don't bother Moab, neither contend with them in battle; for I will not give you of his land for a possession; because I have given Ar to the children of Lot for a possession."

Deuteronomy 2:18

"You are this day to pass over Ar, the border of Moab:

Deuteronomy 2:29

as the children of Esau who dwell in Seir, and the Moabites who dwell in Ar, did to me; until I shall pass over the Jordan into the land which Yahweh our God gives us."

Isaiah 15:1

The burden of Moab: for in a night, Ar of Moab is laid waste, and brought to nothing; for in a night Kir of Moab is laid waste, and brought to nothing.

Treasury of Scripture Knowledge

Summary

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

General references

Bible References

Ar

Numbers 21:28
for a fire has gone out of Heshbon, a flame from the city of Sihon. It has devoured Ar of Moab, The lords of the high places of the Arnon.
Deuteronomy 2:9
Yahweh said to me, "Don't bother Moab, neither contend with them in battle; for I will not give you of his land for a possession; because I have given Ar to the children of Lot for a possession."
Isaiah 15:1
The burden of Moab: for in a night, Ar of Moab is laid waste, and brought to nothing; for in a night Kir of Moab is laid waste, and brought to nothing.

General references

Deuteronomy 2:18
"You are this day to pass over Ar, the border of Moab: