Isaiah
Isaiah 6:6BSB·traditional attribution

Then one of the seraphim flew to me, and in his hand was a glowing coal that he had taken with tongs from the altar.

John Calvin Reformed @genevareformer

6. Then flew one of the seraphim to me. The Prophet shows what kind of relief was brought to him, when he was so terrified as to think that he was a dead man; and this confirms what we have already said, that purity of lips comes from God alone; for men can produce nothing of themselves but what is filthy and abominable.

Matthew Henry Presbyterian @wholebiblehenry

Our curiosity would lead us to enquire further concerning the seraphim, their songs and their services; but here we leave them, and must attend to what passed between God and his prophet. Secret things belong not to us, the secret things of the world of angels, but things revealed to and by the prophets, which concern the administration of God's kingdom among men. Now here we have, I.

Commenting on Isaiah 6:5-8

John Gill Reformed Baptist @doctorgill

Then flew one of the seraphim unto me,.... When the prophet had confessed his sin; for upon that follows the application of pardon; and when the seraph, or minister of the Gospel, had an order from the Lord to publish the doctrine of it: it is God's act alone to forgive sin; it is the work of his ministers to preach forgiveness of sin, and...