It was narrated from 'Amr bin Shu'aib, from his father, from his grandfather, that:the Messenger of Allah went to a camel, and took a hair from its hump between his fingers and said: "I am not entitled to take anything from the Fay, not even this, except the Khumus, and the Khumus will come back to you

English translation · Sunan an-Nasa'i