'Oath' in the Bible

Why then have you not kept the oath of Yahweh, and the commandment that I have instructed you with?"

"If a man sins against his neighbor, and an oath is laid on him to cause him to swear, and he comes and swear before your altar in this house;

As Yahweh your God lives, there is no nation or kingdom, where my lord has not sent to seek you. When they said, 'He is not here,' he took an oath of the kingdom and nation, that they didn't find you.