Isaiah 6:5

Peace. It is proper for sinners to do so, Ecclesiasticus xv. 9. The prophet was grieved that he was unworthy to join in the acclamation of the Seraphim, and had reason to fear death, Genesis xvi. 13., and Exodus xxxiii. 20. He finds himself less able to speak than before, like Moses, Exodus iv. 10., and vi. 12.