Musannaf Ibn Abi Shayba 13:2230

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Muhammad ibn Mahzam narrated to us, from Muhammad ibn Wasi’ al-Azdi, who said: This wealth is not wholesome except through four qualities: a share among the Muslims, or trade from what is lawful, or a gift from a Muslim brother given openly, or an inheritance in the Book of Allah.