Hadith 5:960
Abu Bakr narrated to us, he said: Affan narrated to us, he said: Hammad was asked about those whose hearts are to be reconciled (al-mu'allafati qulubuhum), so he narrated to us: From Yunus, from al-Hasan, he said: They are those who enter into Islam.
حدثنا أبو بكر قال نا عفان قال سئل حماد عن المؤلفة قلوبهم فحدثنا عن يونس عن الحسن قال الذين يدخلون في الإسلام