'Swear' in the Bible

And to whom did he swear they would never enter into his rest, except those who were disobedient?

Now when God made his promise to Abraham, since he could swear by no one greater, he swore by himself,

For people swear by something greater than themselves, and the oath serves as a confirmation to end all dispute.

And above all, my brothers and sisters, do not swear, either by heaven or by earth or by any other oath. But let your "Yes" be yes and your "No" be no, so that you may not fall into judgment.