Matthew 5:37 All you need to say is simply “Yes,” or “No”; anything beyond this comes from the evil one.
When you want to make a promise, what do you back it up with? Words, deeds, money, people, time...
God wants our words to be more like His, promises which are to be kept at all times!
We should not have to go out of our way to make a promise – but to just say yes or no to make sure people understand your word is good and firm!