Maqil bin Yasar reported,

I had a sister whose hand was sought in marriage from me.Ibrahim narrated, from Yunus, from al-Hasan, Maqil bin Yasar told me. And Abu Muamar narrated to us, Abd al-Warith narrated to us, Yunus narrated to us, from al-Hasan, that the sister of Maqil bin Yasar was divorced by her husband. He left her until her waiting period expired, then he sought to marry her again, but Maqil refused. So the verse was revealed, "Do not prevent them from marrying their husbands" [Baqarah 2:232].

Bukhari 4529

Sahih

حدثنا عبيد الله بن سعيد حدثنا أبو عامر العقدي حدثنا عباد بن راشد حدثنا الحسن قال حدثني

معقل بن يسار قال

كانت لي أخت تخطب إلي وقال إبراهيم عن يونس عن الحسن حدثني معقل بن يسار ح حدثنا أبو معمر حدثنا عبد الوارث حدثنا يونس عن الحسن أن أخت معقل بن يسار طلقها زوجها فتركها حتى انقضت عدتها فخطبها فأبى معقل فنزلت {فلا تعضلوهن أن ينكحن أزواجهن}

البخاري 4529صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Tafsir
Chapter
And when you divorce women and they have fulfilled their term, do not prevent them from remarrying their husbands
Numbering
Darussalam 4529
Bukhari 4529