Hadith.5066 - In the narration of Wahb ibn Wahb from Imam Jafar ibn Muhammad Al-Sadiq (as) from his father, Imam Muhammad ibn Ali Al-Baqir (as):
"Indeed, Imam Ali ibn Abi Talib (as) would not administer the legal punishment for insinuation unless it was a clear and explicit accusation, such as saying
'O' adulterer,' or 'O' son of an adulteress,' or 'You are not your father's son.'"