Abbott-Smith Manual Greek Lexicon
βεβαίωσις (G951)
2 βεβαίωσις , -εως, ἡ ( βεβαιόω , q.v.), [in LXX: Le 25:23 ( צְמִיתֻת ), Wi 6:19 *;] confirmation : τ. εὐαγγελίου , Phl 1:7 ; εἰς β. , He 6:16 , a phrase freq. in π. of guarantee in a business transaction (Deiss., BS , 104 ff.; Cremer, 140).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain