From Hasan regarding a Christian [Nasrani] who slanders a Muslim; he said: He is to be whipped eighty times.
Hisham ibn 'Urwa related from his father, who said: If a Christian slanders a Muslim, whipping is the punishment.
From Al-Zuhri, who said regarding those held under safeguard [dhimmis]: They are to be whipped for defaming Muslims.
From 'Amir, who said: A Muslim and Jarmaqani came to me, each of them having fabricated lies about the other; so I whipped Al-Jarmaqani and I left the Muslim alone. And 'Amr ibn 'Abd Al-'Aziz came, and he mentioned it to him, and he said: That's the way!
From 'Asim, who said: I saw Al-Sha'bi having beaten a Christian who had slandered a Muslim. And he ['Asim] said: Beat him! So you can't even see your armpit!
'Ikrama, the freed slave of Ibn 'Abbas, related from Ibn 'Abbas regarding a slave who slanders a free person; he said: He is to be whipped forty times.
From Yahya ibn Sa'id, who said: Abu Bakr ibn Muhammad ibn 'Amr ibn Hazm whipped a slave, who had slandered a free person, eighty times.