'Oaths' in the Bible

“Again, you have heard that it was said to the men of old, ‘You shall not make false vows, but you shall fulfill your vows to the Lord [as a religious duty].’

The king was distressed, but because of his oaths, and because of his dinner guests, he ordered it to be given her.

The king was deeply grieved, but because of his oaths and his dinner guests [who might have regarded him as weak], he was unwilling to [break his word and] refuse her.