John Gills Exposition of the Bible Commentary - Isaiah 27:9
By this therefore shall the iniquity of Jacob be purged ,.... Or "expiated", or "atoned" F1 יכפר "propitiabitur", Pagninus, Montanus; "expiabitur", Piscator. ; not that afflictions are atonements for sin, or give satisfaction to divine justice for it; but they are the means of bringing the Lord's people to a sense of their sins, and to repentance and humiliation for them, and confession of them, and of leading them to the blood and sacrifice of Christ, by which they are expiated and... read more
Matthew Henry's Complete Commentary - Isaiah 27:7-13
Here is the prophet again singing of mercy and judgment, not, as before, judgment to the enemies and mercy to the church, but judgment to the church and mercy mixed with that judgment. I. Here is judgment threatened even to Jacob and Israel. They shall blossom and bud (Isa. 27:6), but, 1. They shall be smitten and slain (Isa. 27:7), some of them shall. If God find any thing amiss among them, he will lay them under the tokens of his displeasure for it. Judgment shall begin at the house of God,... read more