They have dealt treacherously - Literally, “have cloaked,” and so, acted deceitfully. The word is used of treachery of friend toward his friend, of the husband to his wife, or the wife husband. “Surely as a wife treacherously departeth from her husband, so have ye dealt treacherously with Me, O house of Israel, saith the Lord” Jeremiah 3:20. God, even in His upbraiding, speaks very tenderly to them, as having been in the closest, dearest relation to Himself.
For they have begotten strange children - God had made it a ground of the future blessing of Abraham, “I know him, that he will command his children and his household after him, and they shall keep the way of the Lord, to do justice and judgment” Genesis 18:19. But these, contrariwise, themselves being idolaters and estranged from God, had children, who fell away like themselves, strangers to God, and looked upon as strangers by Him. The children too of the forbidden marriages with the pagan were, by their birth, strange or foreign children, even before they became so in act; and they became so the more in act, because they were so by birth. The next generation then growing up more estranged from God than themselves, what hope of amendment was there?
Now shall a month devour - The word now denotes the nearness and suddenness of God’s judgments; the term “month,” their rapidity. A “month” is not only a brief time, but is almost visibly passing away; the moon, which measures it, is never at one stay, waxing until it is full, then waning until it disappears. Night by night bears witness to the month’s decay. The iniquity was full; the harvest was ripe; “now,” suddenly, rapidly, completely, the end should come. One month should “devour them with their portions.” God willed to be the Portion of His people; He had said, “the Lord’s portion is His people; Jacob is the lot of His inheritance” Deuteronomy 32:9. To Himself He had given the title, “the protion of Jacob” Jeremiah 10:16. Israel had chosen to himself “other portions” out of God, for these, he had forsaken his God; therefore he should be consumed with them. “All that they had, all that they possessed, enjoyed, trusted in, all, at once, shall that short space, suddenly and certainly to come; devour, deprive and bereave them of; none of them shall remain with them or profit them in the day of wrath.”