Isaiah 6:2-3

6:2 Seraphs stood over him; each one had six wings. With two wings they covered their faces, with two they covered their feet, and they used the remaining two to fly. 6:3 They called out to one another, “Holy, holy, holy is the Lord who commands armies! His majestic splendor fills the entire earth!”

Isaiah 6:6-7

6:6 But then one of the seraphs flew toward me. In his hand was a hot coal he had taken from the altar with tongs. 6:7 He touched my mouth with it and said, “Look, this coal has touched your lips. Your evil is removed; your sin is forgiven.”