'Bound' in the Bible

But if the unbelieving partner leaves, let him leave. In such cases the [remaining] brother or sister is not [spiritually or morally] bound. But God has called us to peace.

Are you bound to a wife? Do not seek to be released. Are you unmarried? Do not seek a wife.

A wife is bound [to her husband by law] as long as he lives. But if her husband dies, she is free to marry whomever she wishes, only [provided that he too is] in the Lord.