Abbott-Smith Manual Greek Lexicon
δια-μαρτύρομαι (G1263)
15 δια-μαρτύρομαι , depon., of Ionic origin, intensive of the simple μαρτύρομαι , q.v., [in LXX chiefly for עוּד hi., usually c. dat. pers., De 4:26 8:19 , I Ki 8:9 , al. ;] solemnly to protest : Lk 16:28 , Ac 2:40 8:25 10:42 18:5 20:21 , 23 , 24 23:11 28:23 , I Th 4:6 , He 2:6 ; in adjuration, seq. ἐνώπιον τ. θεοῦ , I Ti 5:21 , II Ti 2:14 4:1 (Cremer, 415).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain