Abbott-Smith Manual Greek Lexicon
ὀμνύω (G3660)
30 ὀμνύω (so Hdt. and some Att. writers) and ὄμνυμι (so generally in Att. prose and always in Trag.; Mk 14:71 , -ύναι ), [in LXX chiefly for שׁבע ni.;] to swear , affirm by oath : Mt 26:74 , Mk 14:71 , He 7:21 ; seq. εἰ (q.v.), He 3:11 4:3 ; c. dat. pers., Mk 6:23 ; id. c. inf., He 3:18 ; seq. ὅρκῳ , Ac 2:30 ; ὀ. ὅρκον πρός , c. acc. pers. (cl.), Lk 1:73 ; c. acc. (of that by which one swears; cl., v. MM, xviii), Ja 5:12 ; seq. κατά , c. gen. (LXX; Bl., § 34, 1), He 6:13 , 16 ; seq. ἐν ( εἰς ), as in Heb. (Bl., § 39, 4), Mt 5:34 , 36 23:16 , 18 , 20-22 , Re 10:6 (Bl., § 70, 3).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain