Matthew 5:37

17Therefore, when I was planning this, did I do it lightly? Or the things I plan, do I plan according to the flesh, that with me there should be Yes, Yes, and No, No? 18But as God is faithful, our word to you was not Yes and No. 19For the Son of God, Jesus Christ, who was preached among you by us--by me, Silvanus, and Timothy--was not Yes and No, but in Him was Yes. 20For all the promises of God in Him are Yes, and in Him Amen, to the glory of God through us.

6Let your speech always be with grace, seasoned with salt, that you may know how you ought to answer each one.

12But above all, my brethren, do not swear, either by heaven or by earth or with any other oath. But let your "Yes" be "Yes," and your "No,No," lest you fall into judgment.

19When anyone hears the word of the kingdom, and does not understand it, then the wicked one comes and snatches away what was sown in his heart. This is he who received seed by the wayside.

19For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies.

44You are of your father the devil, and the desires of your father you want to do. He was a murderer from the beginning, and does not stand in the truth, because there is no truth in him. When he speaks a lie, he speaks from his own resources, for he is a liar and the father of it.

25Therefore, putting away lying, "Let each one of you speak truth with his neighbor," for we are members of one another.

9Do not lie to one another, since you have put off the old man with his deeds,

12But above all, my brethren, do not swear, either by heaven or by earth or with any other oath. But let your "Yes" be "Yes," and your "No,No," lest you fall into judgment.