Allâh's Messenger (ﷺ) sent us towards Al-Ḥuraqa, and in the morning we attacked them and defeated them. I and an man followed a man from among them and when we took him over, he said, " La ilâha ill-Allâh (none has the right to be worshipped but Allâh)." On hearing that, the man stopped, but I killed him by stabbing him with my spear. When we returned, the Prophet (ﷺ) came to know about that and he said, "O Usâma ! Did you kill him after he had said La ilâha ill-Allâh (none has the right to be worshipped but Allâh)?" I said, "But he said so only to save himself." The Prophet (ﷺ) kept on repeating that so often that I wished I had not embraced Islâm before that day. [5:568-0.B]