Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Sariyyah Rabi' that he says Hazrat Rabi' bin Khaytham liked sweets. So he would tell us, "Prepare food for me." Thus, we would prepare a lot of food for him. Then he would call Hazrat Farukh and so-and-so. And Hazrat Rabi' would feed and give them drink with his own hand. And he himself would drink what was left of their beverage. Hazrat Rabi' was asked, "How do these two know what you are feeding them?" Upon this, Hazrat Rabi' said, "But Allah Almighty knows."