Abbott-Smith Manual Greek Lexicon
ἅπαξ (G530)
14 ἅπαξ , adv. , [in LXX for אֶחָד , פַּעַם ;] once : II Co 11:25 , He 9:26 , 27 ; ἔτι ἅ. , He 12:26 , 27 ; ἅ. τ. ἐνιαυτοῦ , He 9:7 ; καί ἅ. κ. δίς , twice : Phl 4:16 , I Th 2:18 ; once for all : He 6:4 9:28 10:2 , I Pe 3:18 , Ju 3 , 5 (MM, VGT , s.v.).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain