'Bondage' in the Bible

But if the unbelieving depart, let him depart. A brother or a sister is not under bondage in such cases: but God hath called us to peace.

For though I was free from all men, I brought myself under bondage to all, that I might gain the more.

but I buffet my body, and bring it into bondage: lest by any means, after that I have preached to others, I myself should be rejected.