Musannaf Ibn Abi Shayba 33:192

Yazid ibn Harun narrated to us, he said: Hammad ibn Salamah informed us, from Simak, from al-Nu'man ibn Bashir, from the Prophet, peace and blessings of Allah be upon him, who said: The likeness of the believer is like the body; if a part of it feels pain, the rest of it suffers for that in its entirety.