Musnad Ahmad 32:620

'Affan narrated to us, Hammad ibn Salamah narrated to us, from 'Ali ibn Zayd, and Yunus, and Humayd, from al-Hasan, that the Prophet, peace and blessings of Allah be upon him, said: "The believer is the one whom the people trust with their lives and their wealth." He then mentioned the like of it.