21:10-18 Here is the doom of Judah and Jerusalem. The words used represent the city emptied and utterly desolate, yet not destroyed thereby, but cleansed, and to be kept for the future dwelling of the Jews: forsaken, yet not finally, and only as to outward privileges, for individual believers were preserved in that visitation. The Lord will cast off any professing people who dishonour him by their crimes, but never will desert his cause on earth. In the book of Chronicles we read of Manasseh's repentance, and acceptance with God; thus we may learn not to despair of the recovery of the greatest sinners. But let none dare to persist in sin, presuming that they may repent and reform when they please. There are a few instances of the conversion of notorious sinners, that none may despair; and but few, that none may presume.
13. the line of Samaria, and the plummet of the house of Ahab—Captives doomed to destruction were sometimes grouped together and marked off by means of a measuring-line and plummet (2Sa 8:2; Isa 34:11; Am 7:7); so that the line of Samaria means the line drawn for the destruction of Samaria; the plummet of the house of Ahab, for exterminating his apostate family; and the import of the threatening declaration here is that Judah would be utterly destroyed, as Samaria and the dynasty of Ahab had been.
I will wipe Jerusalem, &c.—The same doom is denounced more strongly in a figure unmistakably significant.