Matthew 5:37 in the King James Version
But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
Context
36 Neither shall you swear by your head, for you can’t make one hair white or black.
37 But let your ‘Yes’ be ‘Yes’ and your ‘No’ be ‘No.’ Whatever is more than these is of the evil one.
38 “You have heard that it was said, ‘An eye for an eye, and a tooth for a tooth.’