Sahih al-Bukhari 3022

It is related that al-Bara' ibn 'Azib said, "The Messenger of Allah, may Allah bless him and grant him peace, sent a group of the Ansar to Abu Rafi' to kill him. One of their men entered their fortress. He said, 'I went into a corral for their animals. They closed the gate of the fortress and then they missed one of their donkeys and went out to look for it. I went out with those who went out, giving the appearance that I was looking for it with them. They found the donkey and went in and I went in as well. They shut the gate of the fortress at night and they put the keys in a small window where I could see them. When they went to sleep. I took the keys and opened the gate of the fortress. Then I went in to him and said, "Abu Rafi'." He answered me and I made for the voice and struck him. He shouted and I went out and came back and then I repeated it as if I was going to help him, "Abu Rafi'", and I altered my voice. He said, "What do you want, woe to your mother?" I said, "What has happened to you?" He said, "I do not know who came to me and struck me."' He said, 'I placed my sword on his belly and then pushed on it until it hit the bone. Then I went out in confusion and came to a ladder of theirs so that I could use it to get down, but I fell and sprained my foot. I went out to my companions and said, 'I will not leave until I hear his death announced.' I did not leave until I heard them announcing the death of Abu Rafi', the merchant of the Hijaz.' He said, 'I got up without anything wrong with me until we went to the Prophet, may Allah bless him and grant him peace, and informed him.'"