‘And Yahweh of hosts revealed himself in my ears. “Surely this iniquity will not be purged from you until you die,” says the Lord, Yahweh of hosts.'
As a result of all this God's anger had been aroused against them even more than before. That was why He had spoken to Isaiah very personally and very specifically (He had ‘revealed Himself in my ears') and had warned him that this sinful and unforgivable behaviour would ensure that they did die, and that until they did nothing would remove it. They had now gone too far in rejecting Him. Their hearts were now hardened beyond repair. Only death awaited them. They were to be their own sacrifice for sin. Their final fate may seem to have been delayed by the good news, but it was sealed by His decree.