The mighty seraphim are heavenly beings not mentioned elsewhere in Scripture (though similar living creatures appear in Revelation 4:6–9; 15:8). The Hebrew term seraphim may be related to a word that means “to burn.” This suggests an association with fire. Their name may point to their shining or fiery nature.
In Isaiah’s vision, each seraph had six wings. With two wings they covered their faces. This showed reverence and humility. Even these powerful heavenly beings did not look directly at God’s glory.