Sunan Ibn Majah
Hadith #2297
It was narrated that 'Umair, the freed slave of Aabi Lahm, said:""My master used to give me food and I would feed others from it, then he stopped me,"" or he said: ""He beat me. So I asked the Prophet,” -or- ""he asked him and I said: 'I will not stop.' He said: 'Both of you will be rewarded