The vision in Isaiah Chapter 6 of seraphim in an idealized version of Solomon's Temple represents the sole instance in the Hebrew Bible of this word being used to describe celestial beings. "... I saw also the Lord sitting upon a throne, high and lifted up, and his train filled the temple. Above it stood the seraphim: each one had six wings; with twain he covered his face, and with twain he covered his feet, and with twain he did fly." (Isaiah 6:1–3) And one cried to another, "Holy, holy, holy, is YHWH of hosts: the whole earth is full of His glory." (verses 2–3) One seraph carries out an act of ritual purification for the prophet by touching his lips with a live coal from the altar (verses 6–7) "And he laid it upon my mouth, and said, Lo, this hath touched thy lips; and thine iniquity is taken away, and thy sin purged."