'Obligation' in the Bible

A husband should fulfill his obligation to his wife, and a wife should do the same for her husband.

But if the unbelieving partner leaves, let him go. In such cases the brother or sister is not under obligation. God has called you to live in peace.

Am I not free [unrestrained and exempt from any obligation]? Am I not an apostle? Have I not seen Jesus our [risen] Lord [in person]? Are you not [the result and proof of] my work in the Lord?

For if I preach the gospel, I have no reason to boast, because an obligation is placed on me. And woe to me if I do not preach the gospel!

For if I preach voluntarily, I get a reward, but if I am unwilling to do it, I am still entrusted with that obligation.

And all [of them] were baptized into Moses [into his safekeeping as their leader] in the cloud and in the sea;