A man who falsely accuses his son: what is due from him?

Ruzayq reports: I wrote to Umar bin Abd al-Aziz about a man who had accused his son of zina (unlawful sexual intercourse). His son said: "If my father is lashed, I will confess." So Umar wrote back to him: "I will lash him, unless he pardons him."

Ibn Jurayj reports from Ata concerning a man who slandered his son. He said: "He is not to be lashed."

Mubarak reports from al-Hasan al-Basri concerning a man who slandered his son. He said: "There is no prescribed punishment (hadd) on him."