It's possible you are thinking of:
* "The Raven": This poem features an angel-like creature, but it's a raven, not a Seraphim.
* "The Fall of the House of Usher": This story mentions angels, but they are not referred to as Seraphim.
* "The Tell-Tale Heart": This story does not feature any angels or supernatural beings.
Could you please provide more context or details about where you saw the "Seraphim" mentioned?