Deut 2:4-5

4and charge the people as follows: You are about to pass through the territory of your kindred, the descendants of Esau, who live in Seir. They will be afraid of you, so, be very careful5not to engage in battle with them, for I will not give you even so much as a foot's length of their land, since I have given Mount Seir to Esau as a possession.