Isaiah 6:6

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.

Isaiah 19:19

19:19 At that time there will be an altar for the Lord in the middle of the land of Egypt, as well as a sacred pillar ¹  dedicated to the Lord at its border.

[19:19]  ¹ tn This word is sometimes used of a sacred pillar associated with pagan worship, but here it is associated with the worship of the Lord.