Sahih al-Bukhari 3868

It is related that an-Nu'man ibn Bashir said, "'Abdullah ibn Rawaha fainted..." with this hadith. "So when he died, she did not weep over him." XLIII: The Prophet, may Allah bless him and grant him peace, sending Usama ibn Zayd to al-Huruqat, a tribe of Juhayna 4021. It is related that Usama ibn Zayd said, "The Messenger of Allah, may Allah bless him and grant him peace, sent us to al-Huraqa, and in the morning we defeated the people, I and a man of the Ansar caught up to one of their men. When we overpowered him, he said, 'There is no god but Allah.' The Ansari held back from him and I stabbed him with my spear until I killed him. When we arrived, that reached the Prophet, may Allah bless him and grant him peace, and he said, 'O Usama, did you kill him after he said, "There is no god but Allah"? I said. "He was trying to save himself.' He continued to repeat it until I wished that I had not become Muslim before that day."