37 Instead, when you make a promise, you should say only “Yes, I will do it.” Or you should say only “No, I will not do it.” If you say anything more than this, what you say is bad. It comes from Satan.’
5:37People used to say these extra words when they made a promise. They wanted other people to know that they would keep their promise. Jesus taught that we should always keep our promises (do what we promised to do).