Numbers 24:18

24:18 Edom will be a possession,

Seir, ¹  his enemies, will also be a possession;

but Israel will act valiantly.

Numbers 29:11

29:11 along with one male goat for a purification offering, in addition to the purification offering for atonement and the continual burnt offering with its grain offering and their drink offerings.

[24:18]  ¹ sn Seir is the chief mountain range of Edom (Deut 33:2), and so the reference here is to the general area of Edom.