Musnad Ahmad 31:277

Waki’ narrated to us, my father narrated to us, from Sa’id ibn Masruq, from Ibn Abi Nu’m, from Abu Sa’id al-Khudri, who said: The *Mu’allafati Qulubuhum* (those whose hearts are to be reconciled) during the time of the Messenger of Allah, may Allah bless him and grant him peace, were four: ‘Alqamah ibn ‘Ulathah al-Ja’fari, al-Aqra’ ibn Habis al-Hanzali, Zayd al-Khayl al-Ta’i, and ‘Uyaynah ibn Badr al-Fazari. He said: Then ‘Ali brought a piece of gold from Yemen with its soil on it, and the Messenger of Allah, may Allah bless him and grant him peace, divided it among them.