John Trapp on Joel 3:21

Verſe 21.Optatus. For I will cleanſe their blood that I have not cleanſed,] i. e. I will clear their conſciences from dead works, from the ſtain and ſting of all ſinne, that they may not queſtion their right to theſe precious promiſes; but boldly take the comfort of them: I will ſay unto them, Such were ſome of you: but ye are waſhed, but ye are juſtified, but ye are ſanctified. Be of good cheer therefore, ſith your ſinnes, your bloody ſinnes are forgiven you. Or thus, I will cleanſe their blood, that is, I will declare that the blood of the godly which the world thought to have been juſtly ſpilt, was indeed innocent blood, and that they were ſlain without cauſe. This I will do, partly by rooting out and damning their enemies, and partly by clearing their innocencie, and crowning their conſtancy. Thus Mercer, Levely, &c.

for the Lord dwelleth in Zion.] This is the laſt promiſe, but not the leaſt. It referreth, ſaith Danaeus, to Chriſt taking our fleſh; by the which he dwelt among us, being God manifeſt in the fleſh, 1 Tim. 3.16. and Joh. 1.14. The word was made fleſh, and dwelt amongſt us, and we ſaw the glory thereof, &c. This is reſerved to the laſt place, as the cauſa & cumulus felicitatis: eſpecially ſince he dwelleth with his Church for ever, as it is in the precedent verſe, and maketh her a true Jehovah Shammah, as ſhe is called, Ezech. 48.35.