Sahih Bukhari Volume 6, Book 60, Hadith Number 399.

Narrated By Yusuf bin Mahik : I was in the house of ‘Aisha, the mother of the Believers. She said, “This revelation: “Nay, but the Hour is their appointed time (for their full recompense); and the Hour will be more previous and most bitter.” (54.46) was revealed to Muhammad at Mecca while I was a playful little girl.”