Borrowed from Koine Greek Σεραφείμ (Serapheím) used in plural, then from Biblical Hebrew שְׂרָפִים (śərāp̄îm)
серафимъ • (serafimŭ) m
Cejtlin, R.M.; Večerka, R.; Blagova, E., editors (1994), “серафимъ”, in Staroslavjanskij slovarʹ (po rukopisjam X—XI vekov) [Old Church Slavonic Dictionary (Based on 10–11th Century Manuscripts)], Moscow: Russkij jazyk, page 601
(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)
серафи́мъ • (serafím) m anim (genitive серафи́ма, nominative plural серафи́мы, genitive plural серафи́мовъ)
| singular | plural | |
|---|---|---|
| nominative | серафи́мъ serafím |
серафи́мы serafímy |
| genitive | серафи́ма serafíma |
серафи́мовъ serafímov |
| dative | серафи́му serafímu |
серафи́мамъ serafímam |
| accusative | серафи́ма serafíma |
серафи́мовъ serafímov |
| instrumental | серафи́момъ serafímom |
серафи́мами serafímami |
| prepositional | серафи́мѣ serafímě |
серафи́махъ serafímax |
Dal, Vladimir (1880–1882) “Сераф”, in Толковый Словарь живаго великорускаго языка [Explanatory Dictionary of the Living Great Russian Language] (in Russian), 2nd edition, Publication of the bookseller-typographer Wolf, M. O.