Genesis 32:3

32:3 And Jacob sent messengers before him to Esau his brother unto the land of Seir, the country of Edom.

Genesis 36:8

36:8 Thus dwelt Esau in mount Seir: Esau [is] Edom.

Deuteronomy 2:5

2:5 Meddle not with them; for I will not give you of their land, no, not so much as a foot breadth; because I have given mount Seir unto Esau [for] a possession.