Musannaf Ibn Abi Shaybah

Hazrat Abu Uthman narrates that a governor of Hazrat Umar bin Khattab wrote a letter to him stating that there are some people here who gather together and pray for the Muslims and the leader. Upon this, Hazrat Umar wrote a reply to him, instructing him to come himself and bring those people with him to his presence. So they came. Hazrat Umar told the doorkeeper: Prepare a whip for me. When those people entered upon Hazrat Umar, he struck their leader with the whip. Upon this, he said: O Commander of the Faithful! Indeed, we are not the people you think we are; these are the people who have come from the direction of the east.