ὀμνύω

Derivation

a prolonged form of a primary, but obsolete , for which another prolonged form is used in certain tenses;

Meaning

to swear, i.e. take (or declare on) oath

In the King James Version

swear

Translated as

swear (13), sware (6), sweareth (4), sworn (3), he (1)

Where it appears

Found in 21 verses

Matthew

5:34, 5:36, 23:16, 23:18, 23:20, 23:21, 23:22, 26:74

Mark

6:23, 14:71

Luke

1:73

Acts

2:30, 7:17

Hebrews

3:11, 3:18, 4:3, 6:13, 6:16, 7:21

James

5:12

Revelation

10:6