Musnad Abu Ya'la al-Mawsili 150:253

Abu Khaythama narrated to us, Ubayd Allah ibn Abd al-Majid narrated to us, Ubayd Allah ibn Abd al-Rahman ibn Mawhab narrated to us, he said: I heard Malik ibn Muhammad ibn Abd al-Rahman, he said: I heard Amra bint Abd al-Rahman narrating from Aisha, that she said: I found in the hilt of the sword of the Messenger of Allah (peace and blessings of Allah be upon him) a writing: "The most insolent of people is one who strikes someone other than the one who struck him, and a man who kills someone other than his killer, and a man who shows allegiance to other than his benefactors. Whoever does that, he has disbelieved in Allah and His Messenger; Allah will not accept from him any obligatory or supererogatory deed." And regarding the reward: "The believers are equal in their blood; the lowest of them strives on behalf of their protection. A Muslim shall not be killed for a disbeliever, nor a person under a covenant while in his covenant. People of two different religions do not inherit from one another. A woman shall not be married [in addition] to her paternal aunt, nor to her maternal aunt. There is no prayer after the Asr [prayer] until the sun sets. And a woman shall not travel for three nights [of distance] without a mahram."