'Oaths' in the Bible

In the morning they arose early and exchanged oaths; then Isaac sent them away and they departed from him in peace.

And it will be to them like a false divination in their eyes; they have sworn solemn oaths. But he brings iniquity to remembrance, that they may be seized.

They speak mere words,With worthless oaths they make covenants;And judgment sprouts like poisonous weeds in the furrows of the field.

Although he was grieved, the king commanded it to be given because of his oaths, and because of his dinner guests.

And although the king was very sorry, yet because of his oaths and because of his dinner guests, he was unwilling to refuse her.