Deuteronomy 24:3-4

And if the second husband has no love for her and, giving her a statement in writing, sends her away; or if death comes to the second husband to whom she was married; Her first husband, who had sent her away, may not take her back after she has been wife to another; for that is disgusting to the Lord: and you are not to be a cause of sin in the land which the Lord your God is giving you for your heritage.