The word Seraphim comes from the plural of the Hebrew word ‘saraph’ meaning ‘to burn.’ Initially, it probably referred to the burning sensation and inflammation caused by the venom of a snake bite. In later passages, the word ‘flying’ attached to the term may have referred to the quick movements snakes make.
In Numbers 21:6, for instance, Seraphim make an appearance in a passage that only makes sense in the context of serpents
And the Lord sent fiery serpents [literally 'Seraphim serpents'] among the people, and they bit the people; so that many people of Israel died.
In Numbers 21:8, The Lord commands Moses to make a ‘fiery serpent’ (‘a saraph’) and put it atop a pole. When those who were bitten looked upon the serpent, they were cured.
Then the LORD said to Moses, “Make a fiery serpent, and set it on a standard; and it shall come about, that everyone who is bitten, when he looks at it, he will live.
Other passages that refer to fiery [seraph] serpents are:
Deuteronomy 8:15 – “He led you through the great and terrible wilderness, with its fiery serpents [saraph] and scorpions and thirsty ground where there was no water; He brought water for you out of the rock of flint.”
Isaiah 14:29 – “For from the serpent’s root a viper will come out, And its fruit will be a flying serpent. [lit 'a flying saraph']”
Seraphim as Winged Creatures
In Isaiah 6:1ff, Seraphim (plural of seraph) are described as creatures with six wings and they no longer retain their serpentine form. In fact, they are described as if they now take the form of humans, with faces, hands and feet, and this is what we usually think of when we hear the term Seraphim.
Also of note – Lucifer is often identified as one of the Seraphim. It’s interesting that the serpent of the Garden of Eden may have some connection with the angelic term.