"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.
ב"ה
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 wolf shall dwell with the lamb, and the leopard shall lie down with the kid; and the calf and the young lion and the fatling together, and a little child shall lead them. And the cow and the bear shall feed, their young ones shall lie down together; and the lion shall eat straw like the ox. And the suckling child shall play on the hole of the cobra, and the weaned child shall put his hand on the viper's nest. They shall not hurt nor destroy in all my holy mountain; for the earth shall be filled with the knowledge of G-d, as the waters cover the sea
–From Isaiah's prophesy on Moshiach, read on the 8th day of Passover
The Parshah