Purely purge away thy dross— See Deuteronomy 2:3. The meaning of these words is, that God would purge the remains of Israel in banishment from the drops and dregs of hypocrites and profane men, and would restore them, thus purged, to their land; the government being entirely renewed under just judges and senators, and prudent teachers. Some suppose that this refers to the times of Christ; but Vitringa is of opinion, that the immediate reference is to that renewal which happened directly after their punishment.
Secondarily, this whole passage may refer to the future and grand redemption through Christ.