But they gave a backsliding shoulder - Like a restive animal, which would not endure the yoke, dull and stupid as the beasts: as Hosea says, “Israel slideth back like a backsliding heifer” Hosea 4:16. Nehemiah confesses the same; “they gave a backsliding shoulder and hardened their neck and would not hear” Nehemiah 9:29.
And made heavy their ears - Fulfilling in themselves what God foretold to Isaiah would be the result of his preaching, “make their ears heavy.” The heart, which will not hearken, becomes duller by the outward hearing, as Paul says, “The earth which drinketh in the rain that cometh oft upon it, and bringeth forth herbs meet for them by whom it is dressed, receiveth blessing from God; but that which beareth thorns and briars is rejected” Hebrews 6:7-8.