They have dealt treacherously against the Lord
Which was the reason of his departure from them; as a woman deals treacherously with her husband when she is unfaithful to him, and commits adultery; so Israel and Judah dealt treacherously with the Lord, who stood in the relation of a husband to them in covenant, by committing idolatry; for they have begotten strange children;
either of strange women, the daughters of idolatrous Heathens they married, so the Targum, Jarchi, and Kimchi; or rather their natural children, though born of Israelitish or Jewish parents, both such; yet being educated by them in an idolatrous way, and brought up in the commission of the evils their parents were guilty of, are said to be strange children to the Lord, alienated from him and his worship, and as such to be begotten: now shall a month devour them with their portions;
the Jews understand this literally of the month Ab, the time of Jerusalem's destruction, so Jarchi and R. Jeshuah in Aben Ezra and Ben Melech; or the month Tammuz, in which the city was broke up, and the month Ab, in which it was destroyed, as Kimchi; or rather, which is also a sense he mentions, it signifies a short time, a very little while before the destruction should come; and compares it with ( Zechariah 11:8 ) ; though, according to the Targum, it is to be understood of every month; and so denotes the continual desolation that should be made, until they were utterly destroyed; but others seem better to interpret it of their new moon, or first day of the month, which they observed in a religious way, by offering sacrifice and on which they depended; but this should be so far from being of any service to them, that it should turn against them; and, because of the idolatry committed in them, the Lord would hate them, and destroy them on account of them; even their farms, and fields, and vineyards, which were their portions and inheritances; see ( Isaiah 1:13 Isaiah 1:14 ) ; unless it is rather to be understood of the parts of the beasts slain in sacrifice on those days, to appease the Lord; which would be so far from doing it, that they would provoke him yet more to wrath, and slay them.