Deuteronomy 2:4-6

4And command the people, saying, Ye are to pass through the border of your brethren the children of Esau, who dwell in Seir; and they will be afraid of you; and ye shall be very guarded:

5attack them not; for I will not give you of their land, no, not so much as a foot-breadth; for I have given mount Seir as a possession unto Esau.

6Ye shall buy of them food for money, that ye may eat; and water shall ye also buy of them for money, that ye may drink;