Moses
Numbers 24:18ESV·traditional attribution

Edom shall be dispossessed; Seir also, his enemies, shall be dispossessed. Israel is doing valiantly.

Matthew Henry Presbyterian

The office of prophets was both to bless and to prophesy in the name of the Lord. Balaam, as a prophet, per force had blessed Israel; here he foretels future events. I. His preface is much the same as that, Num 24:3, Num 24:4. He personates a true prophet admirably well, God permitting and directing him to do so, because, whatever he was, the prophecy itself was a true prophecy.

Commenting on Numbers 24:15-25

John Gill Reformed Baptist

Out of Jacob shall come he that shall have dominion,.... Meaning either David, or rather the Messiah; and so Jarchi interprets this of another ruler out of Jacob, even of the Messiah, of whom it is said, he shall have dominion from sea to sea; Psa 72:8, and shall destroy him, that remaineth of the city; chief city of Edom, or of any of the...

Jamieson-Fausset-Brown Reformed

Edom shall be a possession--This prophecy was accomplished by David (Sa2 8:14). Seir--seen in the south, and poetically used for Edom. The double conquest of Moab and Edom is alluded to (Psa 60:8; Psa 108:9).