Musannaf Ibn Abi Shayba 33:1400

Al-Fadl ibn Dukayn narrated to us, from Ja’far, from Maymun, who said: A man shall not be God-fearing (taqiy) until he holds himself to account more strictly than he holds his business partner to account, until he knows [the source of] his food, his drink, his clothing, and his sustenance.