One of the most unsettled issues in the Christian world (although most claim to have settled it -- but they have not) is the relationship of the Law to the believer, specifically what applies and how it applies.
This issue comes up when we deal with tattoos, for example. But today's issue is about divorce and remarriage. Some top commentators suggest that the main point of Deuteronomy 24:1-4 is to prevent someone who is divorced and remarried to return to the first spouse. The concessions to human nature about divorce might be the secondary issue.
If that is the case, I have never heard or read a Christian statement on the ethics of remarrying a former spouse after having remarried another. The text suggests that even if the new spouse dies, the former spouses cannot be reunited.
So, is this for Christians or no?
Deuteronomy 24:1-4 (ESV) reads:
“When a man takes a wife and marries her, if then she finds no favor in his eyes because he has found some indecency in her, and he writes her a certificate of divorce and puts it in her hand and sends her out of his house, and she departs out of his house, and if she goes and becomes another man's wife, and the latter man hates her and writes her a certificate of divorce and puts it in her hand and sends her out of his house, or if the latter man dies, who took her to be his wife, then her former husband, who sent her away, may not take her again to be his wife, after she has been defiled, for that is an abomination before the Lord. And you shall not bring sin upon the land that the Lord your God is giving you for an inheritance.”