Which have burned incense upon the mountains... — The old inveterate sin of the worship of high places (comp. Isaiah 57:7; Hosea 4:13; Ezekiel 6:13; 2 Kings 15:4; 2 Kings 15:35). The worship paid there to other gods, or nominally to Jehovah in a way which He had forbidden, was practically a “blasphemy” or “reproach” against Him.
Their former work. — Better, I will measure their work first into their bosoms. That was, as it were, the primary duty of the Supreme Ruler.