John Gills Exposition of the Bible Commentary - Isaiah 1:21
How is the faithful city become a harlot !.... The city of Jerusalem, in which were the temple, and the pure worship of God, and was in the tribe of Judah, which ruled with God, and was very faithful with the saints when the ten tribes revolted, and fell in with the sin of Jeroboam; but now, in Isaiah's time, was become like a treacherous wife to her husband, unfaithful to the Lord, went after other lovers, committed spiritual adultery, that is, idolatry, with stocks and stones; and in the... read more
Matthew Henry's Complete Commentary - Isaiah 1:21-30
Here, I. The woeful degeneracy of Judah and Jerusalem is sadly lamented. See, 1. What the royal city had been, a faithful city, faithful to God and the interests of his kingdom among men, faithful to the nation and its public interests. It was full of judgment; justice was duly administered upon the thrones of judgment which were set there, the thrones of the house of David, Ps. 122:5. Men were generally honest in their dealings, and abhorred to do an unjust thing. Righteousness lodged in it,... read more