<https://enterthebible.org/glossary/seraphim#webpage>
<http://schema.org/description>
"Seraphim are a class of celestial beings mentioned in the story of the call of Isaiah. In Christian theology these beings are the highest rank of angels. They sometimes appear in Christian hymnody where, in unceasing chorus, they praise God."
<https://enterthebible.org/glossary/seraphim>