'Yes' in the Bible

Yes, a man will say, "You have faith, and I have works." Show me your faith without works, and I by my works will show you my faith.

But above all things, my brothers, don't swear, neither by heaven, nor by the earth, nor by any other oath; but let your "yes" be "yes," and your "no," "no;" so that you don't fall into hypocrisy.