Narrated to us Muhammad ibn Abdullah ibn Numayr: narrated to us my father: narrated to us Zakariyya, from al-Sha'bi, from al-Nu'man ibn Bashir, who said: The Messenger of Allah (peace and blessings be upon him) said: "The likeness of the believers in their mutual love, mercy, and compassion is the likeness of one body: when a part of it complains, the rest of the body responds to it with sleeplessness and fever."