Seraphim
Verses

Isaiah 6:2

Seraphim stood above Him, each having six wings: with two he covered his face, and with two he covered his feet, and with two he flew.

Isaiah 6:3

And one called out to another and said, "Holy, Holy, Holy, is the LORD of hosts, The whole earth is full of His glory."

Revelation 4:8

And the four living creatures, each one of them having six wings, are full of eyes around and within; and day and night they do not cease to say, "HOLY, HOLY, HOLY is THE LORD GOD, THE ALMIGHTY, WHO WAS AND WHO IS AND WHO IS TO COME."

Isaiah 6:6-7
Then one of the seraphim flew to me with a burning coal in his hand, which he had taken from the altar with tongs. He touched my mouth with it and said, "Behold, this has touched your lips; and your iniquity is taken away and your sin is forgiven."