Genesis 27:40

(40) When thou shalt have the dominion.—This rendering of a rare and difficult Hebrew word is scarcely more than a guess made by two or three ancient Jewish commentators. Its real meaning here, and in Jeremiah 2:31, Hosea 11:12, is to toss the yoke—be restless and unquiet. The prophecy of Edom’s subjection to his brother was literally fulfilled, as Idumæa was for ages a mere dependency upon Judah; but in the days first of Joram, and then of Ahaz, it revolted, and recovered its freedom. It was again conquered by Hyrcanus, the nephew of Judas Maccabaeus; nor was its subject condition altered by the fact that the dynasty of the Herods was of Edomite extraction. In troubled times, then, it broke the yoke from its neck; but generally Edom served his brother.