Matthew 5:36

Verse 36. Neither shalt thou swear by thy head] For these plain reasons:

1st. God commands thee not to do it.

2dly. Thou hast nothing which is thy own, and thou shouldst not pledge another's property.

3dly. It never did, and never can, answer any good purpose. And

4thly. Being a breach of the law of God, it is the way to everlasting misery.