G3727
ὅρκος
oath
ὅρκος, -ου, ὁ [in LXX chiefly for שֶׁוַע, שִׁבְעָה and cogn. forms ;] an oath: Mat.14:7 26:72, Luk.1:73, Act.2:30, Heb.6:16-17, Jas.5:12; p1., Mat.5:33 (LXX) Mat.14:9, Mrk.6:26.† (AS)
The KJV translates G3727 in the following manner:
oath (14x), sake (4x), oaths (2x)
Full Thayer's lexicon entry
ὅρκος — hórkos
ὅρκος, ὅρκου, ὁ (from ἔργῳ, εἴργω; equivalent to ἕρκος an enclosure, confinement; hence, Latinorcus) (from Homer down), the Sept. for שֲׁבוּעָה, an oath: Mat 14:7; Mat 14:9; Mat 26:72; Mar 6:26; Luk 1:73 (Winers Grammar, 628 (583); Buttmann, § 144, 13); Act 2:30 (Winer's Grammar, 226 (212); 603 (561)); Heb 6:16; Jas 5:12; by metonymy, that which has been pledged or promised with an oath; plural vows, Mat 5:33 ((cf. Wünsche ad loc.)).
10 occurrences
Matthew (4), Mark (1), Luke (1), Acts (1), Hebrews (2), James (1)