'Oath' in the Bible

I counsel you to keep the command of the king because of the oath before God [by which you swore loyalty to him].

It is the same for all. There is one fate for the righteous and for the wicked; for the good, for the clean and for the unclean; for the man who offers sacrifices and for the one who does not sacrifice. As the good man is, so is the sinner; as he who swears an oath is, so is he who is afraid to swear an oath.