Musannaf Ibn Abi Shayba 37:131

Yazid ibn Harun narrated to us, he said: Hammad ibn Salama informed us, from Ali ibn Zayd, that Ali sent for Muhammad ibn Maslama to come to him. He sent to him and said: "If he does not come to me, then carry him." So they came to him, and he refused to come to him. They said: "We have been ordered that if you do not come to him, we are to carry you until we bring you to him." He said: "Return to him and say to him: 'Your cousin and my intimate friend (the Prophet) made a covenant with me that there would be a tribulation, a division, and a disagreement. So when that happens, sit in your house and break your sword until a decisive death comes to you or an erring hand. So fear Allah, O Ali, and do not be that erring hand.'" They went to him and informed him, and he said: "Leave him."