Musannaf Ibn Abi Shayba 13:2894

Abu Bakr narrated to us, he said: Affan narrated to us, he said: Hammad bin Salamah narrated to us, from Yunus, from al-Hasan regarding His saying: "Then make a contract with them if you know within them goodness," he said: The goodness is the Quran and Islam. And Sa'id bin Abi al-Hasan said: Islam and wealth.