Matthew 5:37

37 All you need to say is simply ‘Yes’ or ‘No’; anything beyond this comes from the evil one.a

Read Matthew 5:37 Using Other Translations

But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
Let what you say be simply 'Yes' or 'No'; anything more than this comes from evil.
Just say a simple, ‘Yes, I will,’ or ‘No, I won’t.’ Anything beyond this is from the evil one.