Aamir bin Sa’d bin Abi Waqqas narrates from his father: The Prophet Muhammad (peace be upon him) gave some gifts to certain people. He did not give anything to one of them. I said: O Messenger of Allah! You have given to so-and-so and so-and-so, but you have not given anything to that person, even though he is a believer. The Prophet (peace be upon him) said: Is he a believer or a Muslim? He said this three times.

Zuhri says: We understand this to mean: By Islam is meant verbally reciting the testimony of faith, and by Iman is meant acting upon it.