It was narrated from Sharik bin 'Abdullah bin Abu Namir that he heard Anas bin Malik say: "While we were sitting in the Masjid, a man entered riding a camel; he made it kneel in the Masjid, then he hobbled it and said to them: 'Which of you is Muhammad?' The Messenger of Allah was reclining among them,so they said:'This fairskinned man who is reclining:The man said to him: '0 son of 'Abdul-Muttalib!' The Prophet said: 'I am listening to you: The man said: 0 Muhammad! I am asking you and will be stern in asking, so do not bear any ill feelings towards me: He said: 'Ask whatever you think: The man said: 'I abjure you by your Lord and the Lord of those who came before you, has Allah sent you to all of mankind?' The Messenger of Allah said: 'By Allah, yes'. He said: 'I abjure you by Allah, has Allah commanded you to pray the five prayers each day and night?' The Messenger of Allah said: 'By Allah, yes'. He said: 'I abjure you by Allah, has Allah commanded you to fast this month each year?' The Messenger of Allah said: 'By Allah, yes'. Be said: 'I abjure you by Allah, has Allah commanded you to take this charity from our rich and distribute it among our poor?'.The Messenger of Allah said: 'By Allah, yes'. The man said: 'I believe in what you have brought, and I am the envoy of my people who are behind me. I am Dimam bin Tha'labah, the brother of Banu Sa'd bin Bakr:" (Sahih)