Pethor

He sent messengers to Bil'am the son of B'or, at P'tor by the [Euphrates] River in his native land, to tell him, "Listen, a people has come out of Egypt, spread over all the land and settled down next to me.

because they did not supply you with food and water when you were on the road after leaving Egypt, and because they hired Bil'am the son of B'or from P'tor in Aram-Naharayim to put a curse on you