The prophet Isaiah tells us that the seraphim are six-winged “fiery” angels who surround God as He sits upon His exalted throne and who worship God continually (Isaiah 6). The seraphim also minister to the Lord and serve as His agents of purification, as demonstrated by their cleansing of Isaiah’s sins before he began his prophetic ministry.
Angels and Demons
Who Are the Seraphim? The Seraphim in the Bible