Therefore shalt thou fall - The two parts of the verse fill up each other. “By day and by night shall they fall, people and prophets together.” Their calamities should come upon them successively, day and night. They should stumble by day, when there is least fear of stumbling John 11:9-10; and night should not by its darkness protect them. Evil should come “at noon-day” Jeremiah 15:8 upon them, seeing it, but unable to repel it; as Isaiah speaks of it as an aggravation of trouble, “thy land strangers devour it in thy presence” Isaiah 1:7; and the false prophets, who saw their visions in the night, should themselves be overwhelmed in the darkness, blinded by moral, perishing in actual, darkness.
And I will destroy thy mother - Individuals are spoken of as the children; the whole nation, as the mother. He denounces then the destruction of all, collectively and individually. They were to be cut off, root and branch. They were to lose their collective existence as a nation; and, lest private persons should flatter themselves with hope of escape, it is said to them, as if one by one, “thou shalt fall.”