Volume 6, Book 60, Number 52:
Narrated Al-Hasan:
The sister of Ma’qal bin Yasar was divorced by her husband who left her till she had fulfilled her
term of ‘Iddat (i.e. the period which should elapse before she can Remarry) and then he wanted to
remarry her but Maqal refused, so this Verse was revealed:–
“Do not prevent them from marrying their (former) husbands.” (2.232)