Hadith 10:787
Abu Bakr narrated to us, he said: Ibrahim ibn Sadaqah narrated to us, from Yunus, from al-Hasan, regarding the woman who has obtained khul' (divorce by ransom): If her husband wishes to take her back, he said: He proposes to her with a new dowry.
حدثنا أبو بكر قال نا إبراهيم بن صدقة عن يونس عن الحسن في المختلعة إذا أراد زوجها مراجعتها قال يخطبها بمهر جديد