'Oath' in the Bible

I pray thee, the commandment of a king keep, even for the sake of the oath of God.

The whole is as to the whole; one event is to the righteous and to the wicked, to the good, and to the clean, and to the unclean, and to him who is sacrificing, and to him who is not sacrificing; as is the good, so is the sinner, he who is swearing as he who is fearing an oath.