Sayyiduna Usamah bin Zayd (may Allah be pleased with him) reports: The Messenger of Allah (peace and blessings be upon him) sent us to al-Huraqat of the tribe of Juhaynah. We came upon those people in the morning, and they had been alerted to us. The narrator said: We pursued them, and I caught one of their men. As soon as I reached him, he recited La ilaha illa Allah (there is none worthy of worship but Allah). I thought that he had recited this statement out of fear, so I charged at him and killed him. Then the matter came to my mind, so I mentioned it to the Prophet (peace and blessings be upon him). At this the Messenger of Allah (peace and blessings be upon him) said to me: "He recited La ilaha illa Allah and you still killed him?!" I said: "O Messenger of Allah (peace and blessings be upon him)! He did not recite this statement from his heart; he recited it only out of fear of the weapons!" He (peace and blessings be upon him) said: "He recited La ilaha illa Allah and then you killed him. Why did you not cut open his heart, so that you would have known that he recited this statement out of fear of the weapons?!" Sayyiduna Usamah (may Allah be pleased with him) said: He (peace and blessings be upon him) kept saying to me: "He recited La ilaha illa Allah and you still killed him!" until I wished that I had not embraced Islam until that very day!