Musannaf Ibn Abi Shaybah

It is narrated about Hazrat Rabee’ that he said to his family: Prepare halwa for me. So, halwa was cooked, then he called a madman and Hazrat Rabee’ began to feed him morsels, and his saliva was flowing. When he had eaten and left, the family said to Hazrat Rabee’: We made an effort and prepared it, and then you fed it to such a person who does not even know what he has eaten. Hazrat Rabee’ replied: But Allah knows.