'Bound' in the Bible

But if the unbeliever go away, let them go away; a brother or a sister is not bound in such cases, but God has called us in peace.

Art thou bound to a wife? seek not to be loosed; art thou free from a wife? do not seek a wife.

A wife is bound for whatever time her husband lives; but if the husband be fallen asleep, she is free to be married to whom she will, only in the Lord.