'Swear' in the Bible

"Again you have heard that it was said to the {people of old}, 'Do not swear falsely, but fulfill your oaths to the Lord.'

But I say to you, do not swear at all, either by heaven, because it is the throne of God,

And do not swear by your head, because you are not able to make one hair white or black.

Then he began to curse and to swear with an oath, "I do not know the man!" And immediately a rooster crowed.