Musannaf Ibn Abi Shaybah

Hazrat Abu Majlez narrates that when Hazrat Abdullah bin Khabbab was in the captivity of the Khawarij, at that time one of their men passed by a date palm tree and picked up a date. His companions said to him, "You have picked up a date belonging to a dhimmi!" Then they passed by a pig, and a man struck it with his sword, so his companions said, "You have killed a pig belonging to a dhimmi!" Upon this, Hazrat Abdullah bin Khabbab said, "Shall I not tell you about someone who is more sacred than both of these?" They asked, "Who is that?" Hazrat Abdullah bin Khabbab replied, "That is me. I have not abandoned prayer, nor have I abandoned such-and-such deed, nor such-and-such deed." Despite this, they martyred Hazrat Abdullah bin Khabbab. When they came to Hazrat Ali (may Allah be pleased with him) and said to him, "Hand over to us the killers of Hazrat Abdullah," he replied, "How can we hand over his killers to you when we are all partners in his blood?" After this, Hazrat Ali (may Allah be pleased with him) declared fighting them to be lawful.