Musannaf Ibn Abi Shayba 13:698

Abu Bakr narrated to us, he said: Abd al-Rahim ibn Sulayman narrated to us, from Hajjaj, from Amr ibn Shu’ayb, from his father, from his grandfather, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The Muslims are witnesses for one another, except for one who has been punished for a false accusation."