Important Message Regarding This Lesson
The Daily Mitzvah schedule runs parallel to the daily study of 3 chapters of Maimonides' 14-volume code. There are instances when the Mitzvah is repeated a few days consecutively while the exploration of the same Mitzvah continues in the in-depth track.
Remarrying a Divorced Wife Who Remarried in the Interim
"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.
Levirate Marriage
"Her husband's brother shall be intimate with her"—Deuteronomy 25:5.
The brother of a married man who dies childless is commanded to marry his widowed sister-in-law. [See Positive Commandment 217 for the mechanism by which this mitzvah can be bypassed.]