(21) I will cleanse . . .--The LXX. translate this sentence, "I will avenge their blood, and not leave it unavenged"--i.e., the "innocent blood" mentioned in Joel 3:19; but the promise seems rather to indicate, as in the English Version, the extension of God's pardon to those hitherto unpardoned.

The Lord dwelleth in Zion--i.e., over a raging and swelling world, probably unconscious of Him, the Lord nevertheless reigns in the heavenly Jerusalem, and all His redeemed shall dwell securely under His eternal rule. "And the name of the city from that day shall be Jehovah Shammah, the LORD IS THERE (Ezekiel 48:35).

3:18-21 There shall be abundant Divine influences, and the gospel will spread speedily into the remotest corners of the earth. These events are predicted under significant emblems; there is a day coming, when every thing amiss shall be amended. The fountain of this plenty is in the house of God, whence the streams take rise. Christ is this Fountain; his sufferings, merit, and grace, cleanse, refresh, and make fruitful. Gospel grace, flowing from Christ, shall reach to the Gentile world, to the most remote regions, and make them abound in fruits of righteousness; and from the house of the Lord above, from his heavenly temple, flows all the good we daily taste, and hope to enjoy eternally.For I will cleanse their blood which I have not cleansed,.... Which some understand, as the Targum, of the Lord's, inflicting further punishments on the, enemies of his people, for shedding their innocent blood; and that he will not expiate their sins, nor hold them guiltless, or suffer them to go unpunished; but rather this is to be interpreted in a way of grace and mercy, as a benefit bestowed on Judah and Jerusalem, who are the immediate antecedents to the relative here; and in the words a reason is given why they should dwell safely and peaceably for ever, because the Lord will justify them from their sins; forgive their iniquities; cleanse them from all their pollution, signified by blood; of which grace they will have had no application made to them till this time; but now all their guilt and faith will be removed; and particularly God will forgive, and declare to be forgiven their sin of crucifying Christ; whose blood they had imprecated upon themselves and their children, and which has remained on them; but now will be removed, with all the sad effects of it. Though this may also refer to the conversion of the Gentiles, and the pardon of their sins, and the sanctification of their persons, in such places and parts of the world, where such blessings of grace have not been bestowed in times past for many ages, if ever;

for the Lord dwelleth in Zion; and therefore will diffuse his grace, and spread the blessings of it all around: or "even the Lord that dwelleth in Zion" (d); he will do what is before promised; being the Lord, he can do it; and dwelling in Zion his church, it may be believed he will do it; and this will be for ever, when his Shechinah shall return thither in the days of the Messiah, as Kimchi observes.

(d) "even I the Lord", margin of our Bibles.