Cherubim (singular cherub) is an order of angels. According to Genesis, the gates of the Garden of Eden are guarded by two cherubim, holding flaming swords, to bar entry back into the Garden. Cherubim also decorate the Ark of the Covenant.
"Cherubim" is expressly mentioned 57 times by both the ESV and KJV translations, entirely in the Old Testament except for one reference at Hebrews 9:5 :
“ | Above it were the cherubim of glory overshadowing the mercy seat. Of these things we cannot now speak in detail. | ” |