Matthew 5:37

But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.

But let your 'Yes' be 'Yes' and your 'No' be 'no.' Whatever is more than these is of the evil one.

But let your speech be, Yea, yea; Nay, nay: and whatsoever is more than these is of the evil `one'.

but let your word be, Yes, Yes, No, No, and that which is more than these is of the evil.

Simply let your ‘Yes’ be ‘Yes,’ and your ‘No,’ ‘No.’ Anything more comes from the evil one.