Sahih Bukhari Volume 006, Book 060, Hadith Number 212.
Narrated By Az-Zuhri : Urwa bin Az-Zubair, Said bin Al-Musaiyab, 'Al-Qama bin Waqqas and 'Ubaidullah bin 'Abdullah related the narration of 'Aisha, the wife the Prophet, when the slanderers had said about her what they had said and Allah later declared her innocence. Each of them related a part of the narration (wherein) the Prophet said (to 'Aisha). "If you are innocent, then Allah will declare your innocence: but if you have committed a sin, then ask for Allah's Forgiveness and repent to him." 'Aisha said, "By Allah, I find no example for my case except that of Joseph's father (when he said), 'So (for me) patience is most fitting.' " Then Allah revealed the ten Verses: "Verily those who spread the slander are a gang amongst you..." (24.11)