What is the context of Isaiah 1:21-22?

• Diagnosis and Judgment (Isaiah 1:21-23 true)
• The Unfaithful City (Isaiah 1:21-31 true)
• Zion Corrupted, to Be Redeemed (Isaiah 1:21-31 true)
• Unfaithful Jerusalem (Isaiah 1:21-31 true)
• The Degenerate City (Isaiah 1:21-31 true)
• Purifying Jerusalem (Isaiah 1:21-31 true)
• Purification of Jerusalem (Isaiah 1:16-31 true)
• A Rebellious Nation (Isaiah 1:2-31 true)