The Mekhilta, the tannaitic midrash on Exodus, turns to one of the most severe prophecies in the Hebrew Bible: the destruction of Esau's descendants. The prophet Obadiah declares: "And there will be no survivor of the house of Esau, for the mouth of the Lord has spoken" (Obadiah 1:18). Total annihilation. No remnant. And then the telltale phrase — "the mouth of the Lord has spoken." The rabbis ask: where?
The Mekhilta traces the original statement to the oracle of Balaam in (Numbers 24:18-19): "And Edom will become an inheritance ... and a victor will issue from Jacob and will destroy all trace of Ir." Balaam, the pagan prophet hired to curse Israel, instead found himself compelled by God to utter prophecy after prophecy of Israel's triumph. His words about Edom — the nation descended from Esau — were not his own. They came from the mouth of the Lord.
Obadiah's prophecy, delivered centuries later, is therefore not a new sentence. It is the fulfillment of what God decreed through Balaam's unwilling mouth on the plains of Moab. The destruction of Edom was written into the fabric of prophecy from the earliest chapters of Israel's national story.
The Mekhilta's linkage carries a heavy theological message: the fate of nations is not random. What God speaks through one prophet, He confirms through another, across centuries.