Abbott-Smith Manual Greek Lexicon
βεβαιόω (G950)
8 βεβαιόω , -ῶ ( βέβαιος ), [in LXX: Ps 40 (41):12 ( נצב hi.), 118 (119):28 ( קוּם pi.), III Mac 5:42 *;] to confirm , establish , secure , of things (cl.): λόγον , Mk 16:[20] ; ἐπαγγελίας , Ro 15:8 ; of persons ( DCG , ii, 605): I Co 1:8 , II Co 1:21 . Pass., I Co 1:6 , Col 2:7 , He 2:3 13:9 (as an Attic legal term, to guarantee the validity of a purchase, establish or confirm a title; v. next word, Cremer, 139; cf. δια-β. ).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain