I finally found the passage that says that when you divorce, and your wife remarries, it is not permitted for you to reconcile with her again even if she leaves her new husband or her new husband dies. In fact, it is considered an abomination before the Lord.
Note that in this law, it was not a sin to write your wife a certificate of a divorce. But it was an abomination to take her back after she remarried.
Deuteronomy 24:1 “When a man takes a wife and marries her, and it happens that she finds no favor in his eyes because he has found some uncleanness in her, and he writes her a certificate of divorce, puts it in her hand, and sends her out of his house, 2 when she has departed from his house, and goes and becomes another man’s wife, 3 if the latter husband detests her and writes her a certificate of divorce, puts it in her hand, and sends her out of his house, or if the latter husband dies who took her as his wife, 4 then her former husband who divorced her must not take her back to be his wife after she has been defiled; for that is an abomination before the LORD, and you shall not bring sin on the land which the LORD your God is giving you as an inheritance.
Note that in this law, it was not a sin to write your wife a certificate of a divorce. But it was an abomination to take her back after she remarried.
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