Chapter 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
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)
Sahih al-Bukhari 4529