'Swear' in the Bible

Then he began to curse and swear, “I do not know the man!” And immediately a rooster crowed.

But he began to curse and swear, “I do not know this man you are talking about!”

And to whom did He swear that they would not enter His rest, but to those who were disobedient?

For when God made the promise to Abraham, since He could swear by no one greater, He swore by Himself,

For men swear by one greater than themselves, and with them an oath given as confirmation is an end of every dispute.

But above all, my brethren, do not swear, either by heaven or by earth or with any other oath; but your yes is to be yes, and your no, no, so that you may not fall under judgment.