Abbott-Smith Manual Greek Lexicon
μαρτύρομαι (G3143)
5 ** μαρτύρομαι ( μάρτυρ ), [in LXX: Jth 7:28 , I Mac 2:56 א )*;] to summon as witness (M, Th. , 25 f.; Hort., 1Pe. , 53 f.; Lft., Notes , 29; Ga 203), hence, to protest , affirm solemnly : seq. ὅτι , Ac 20:26 , Ga 5:3 ; to adjure , beseech : c. dat. pers., Ac 26:22 ; c. acc. et inf., Eph 4:17 ; seq. εἰς , I Th 2:12 (cf. δια- , προ-μαρτύρομαι ).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain