Obligation

If a woman in her husband’s house has made a vow or put herself under an obligation with an oath,

…then when the land is subdued before the LORD, you may return and be free of obligation to the LORD and to Israel. And this land will belong to you as a possession before the LORD.

We also place ourselves under the obligation to contribute a third of a shekel yearly for the service of the house of our God:

Now the wages of the worker are not credited as a gift, but as an obligation.

For when you were slaves to sin, you were free of obligation to righteousness.

Therefore, brothers, we have an obligation, but it is not to the flesh, to live according to it.

Though I am free of obligation to anyone, I make myself a slave to everyone, to win as many as possible.