Abbott-Smith Manual Greek Lexicon
ἀσφάλεια (G803)
3 ἀσφάλεια , -ας, ἡ ( ἀσφαλής ), [in LXX for בֶּטַח , etc.;] firmness . certainty : Lk 1:4 . security : Ac 5:23 , I Th 5:3 . (In π. it is used as a law-term, proof , security ; v. MM, s.v.; M, I Th 5:3 .)†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain