Charles Ellicott Commentary Isaiah 3:9

"The show of their countenance doth witness against them; and they declare their sin as Sodom, they hide it not. Woe unto their soul! for they have done evil unto themselves." — Isaiah 3:9 (ASV)

They declare their sin as Sodom. —The comparison, it should be remembered, is probably from an earlier date than that in Isaiah 1:10. In the reign of Ahaz (perhaps the prophet, editing in his old age, also thought of that of Manasseh), there was not even the homage that vice pays to virtue by feigning a virtue it does not have. Men fell into an utter shamelessness, like that of the cities of the plain (Genesis 19:5), generally in the luxury and profligacy of their lives (Ezekiel 16:49), and perhaps also with a more definite and horrible resemblance (1 Kings 14:24; 1 Kings 15:12; 2 Kings 23:7).

Woe unto their soul! —In the midst of the confusions of the times, the prophet is commanded to proclaim that the law of a righteous retribution would be seen working even there.