ὀμνύω (
Matthew 23:20; 
Matthew 26:74; 
Hebrews 6:16; 
James 5:12; (
Winer's Grammar, 24)) and 
ὄμνυμι (
ὀμνύναι, 
Mark 14:71 G L T Tr WH (cf. B. 45 (39))) form their tenses from 
ὈΜΟΩ; hence, 1 aorist 
ὤμοσα; the 
Sept. for 
נִשְׁבַּע; 
to swear; to affirm, promise, threaten, with an oath: absolutely, followed by direct discourse, 
Matthew 26:74; 
Mark 14:71; 
Hebrews 7:21; followed by 
εἰ, 
Hebrews 3:11; 
Hebrews 4:3; see 
εἰ I. 5. 
ὀμνύειν ὅρκον (often so in Greek writings from 
Homer down (
Winer's Grammar, 226 (212))) 
πρός τινα, to one (
Homer, Odyssey 14, 331; 19, 288), 
Luke 1:73; 
ὀμνύειν with the dative of the person to whom one promises or threatens something with an oath: followed by direct discourse 
Mark 6:23; by an infinitive (
Winer's Grammar, 331 (311)), 
Hebrews 3:18; with 
ὅρκῳ added, 
Acts 2:30 (
Winer's Grammar, 603 (561)); 
τίνι τί, 
Acts 7:17 (
Rec. i. e. genitive by attraction; cf. 
Buttmann, § 143, 8; 
Winer's Grammar, § 24, 1). that by which one swears is indicated by an accusative, 
τινα or 
τί (so in classical Greek from 
Homer down (cf. 
Winer's Grammar, § 32, 1 b. 
γ.; 
Buttmann, 147 (128))), 
in swearing to call a person or thing as witness, to invoke, swear by (
Isaiah 65:16; 
Josephus, Antiquities 5, 1, 2; 7, 14, 5); 
τόν οὐρανόν, 
τήν γῆν, 
James 5:12; with prepositions (cf. 
Buttmann, as above): 
κατά τίνος (see 
κατά, I. 2 a.), 
Hebrews 6:13, 
16 (
Genesis 22:16; 
Genesis 31:54; 
1 Samuel 28:10 (
Complutensian); 
Isaiah 45:23; 
Isaiah 62:8; 
Amos 4:2; 
Demosthenes, p. 553, 17; 553, 26 (others, 
ἐπομνύειν), etc.; 
κατά πάντων ὠμνυε θεῶν, Long. past. 4, 16); in imitation of the Hebrew 
נִשְׁבַּע followed by 
בְּ, 
ἐν τίνι is used (
Winers Grammar, 389 (364); 
Buttmann, the passage cited; see 
ἐν, I. 8{b}): 
Matthew 5:34, 
36; 
Matthew 23:16, 
18, 
20-22; 
Revelation 10:6; 
εἰς εἰ, with the mind directed unto (
Winers Grammar, 397 (371); 
Buttmann, as above; see 
εἰς, B. II. 2 a.), 
Matthew 5:35. 
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