they hired. Compare Numbers 22:5.Jude 1:11.
Mesopotamia. Hebrew. Aram-Naharaim, i.e. "Syria of the two rivers".
Related Commentaries of Deuteronomy 23:4
Deuteronomy 23:4
4 Because they met you not with bread and with water in the way, when ye came forth out of Egypt; and because they hired against thee Balaam the son of Beor of Pethor of Mesopotamia, to curse thee