Maliks Muwatta Book 19, Hadith Number 14.

Ziyad related to me from Malik from Humayd at-Tawil that ‘Anas ibn Malik said, “The Messenger of Allah, may Allah bless him and grant him peace, came out to us in Ramadan and said, ‘I was shown a certain night in Ramadan and then two men abused each other and it was taken away. Look for it on the ninth and the seventh and the fifth.'”