"Her first husband who sent her away may not marry her again"—Deuteronomy 24:4.
It is forbidden for a man to remarry a woman he divorced if she has remarried [and subsequently been divorced again or widowed] in the interim.
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Daily Mitzvah (Rambam)
Day 80: Negative Commandment 356
From the Sichos in English Collection
Negative Commandment 356 (Digest)
Remarrying a Divorced Wife Who Remarried in the Interim
From Sefer Hamitzvot, published and copyright by Sichos in English. To purchase the Sefer Hamitzvot two-volume set, please click here.
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Rambam Study Tracks
Daily Quote
The tunic [worn by the High Priest] atoned for bloodshed, the breeches atoned for lewdness, the turban made atonement for arrogance, the belt atoned for [impure] meditations of the heart, the breastplate atoned for neglect of civil laws, the apron atoned for idolatry, the cloak atoned for slander, and the crown, worn on the forehead, atoned for brazenness.
–Talmud, Zevachim 88b
The Parshah