'Oath' in the Bible

Yea, all Israel have transgressed thy law, even by departing, that they might not obey thy voice; therefore the curse is poured upon us, and the oath that is written in the law of Moses the servant of God, because we have sinned against him.

Then I heard the man clothed in linen who was over the waters of the river as he raised both his right and left hands to the sky and made an oath by the one who lives forever: "It is for a time, times, and half a time. Then, when the power of the one who shatters the holy people has been exhausted, all these things will be finished."