Charles Ellicott Commentary Isaiah 10:27

"And it shall come to pass in that day, that his burden shall depart from off thy shoulder, and his yoke from off thy neck, and the yoke shall be destroyed by reason of fatness." — Isaiah 10:27 (ASV)

The yoke shall be destroyed because of the anointing ... —The English, as it stands, is scarcely intelligible, but suggests the idea that the “anointing” was that which marked out the kings and priests of Judah as a consecrated people, and the remembrance of which would lead Jehovah to liberate them from bondage. Most commentators, however, render “by reason of the fat,” the implied figure being that of a bullock which grows so fat that the yoke will no longer go round his neck, as the symbol of a people growing strong and asserting its freedom. Compare Jeshurun waxed fat and kicked (Deuteronomy 32:15).