Musannaf Ibn Abi Shaybah 40734 — Reports on the Khawarij

Abu Mijlaz said: When Abdullah bin Khabbab was in the hands of the Khawarij, one of their men passed by a date palm and picked up a date. His companions said to him: "You have taken a date of a dhimmi!" Then they passed by a pig, and a man struck it with a sword, and his companions said: "You have killed the pig of a dhimmi!" At this Abdullah bin Khabbab said: "Shall I not tell you of one more sacred than these two?" They said: "Who is it?" Abdullah bin Khabbab said: "It is I. I have not abandoned the prayer, I have not abandoned such-and-such a deed, and I have not abandoned such-and-such a deed." Even so, they killed Abdullah bin Khabbab. When Sayyiduna Ali (may Allah be pleased with him) came to them and said to them: "Hand over to us the killers of Abdullah," they said: "How can we hand over his killers to you, when all of us have shared in his blood?" After this Sayyiduna Ali (may Allah be pleased with him) declared fighting them lawful.