What did the seraph put on Isaiah's mouth in chapter 6?
If she bear a maid child, then she shall be unclean two weeks ... and she shall continue in the blood of her purifying threescore and six days. Leviticus 12:5
Then flew one of the seraphims unto me, having a live coal in his hand, which he had taken with the tongs from off the altar:
And he laid it upon my mouth. Isaiah 6:6