'Bound' in the Bible

But if the unbeliever leaves, let him leave. A brother or a sister is not bound in such cases. God has called you to live in peace.

Art thou bound unto a wife? seek not to be loosed. Art thou loosed from a wife? seek not a wife.

The wife is bound by the law as long as her husband liveth; but if her husband be dead, she is at liberty to be married to whom she will; only in the Lord.