Sahih al-Bukhari — Merits of the Helpers in Madinah (Ansaar) — Hadith No: 3849
Translation
Narrated `Amr bin Maimun:During the pre-Islamic period of ignorance I saw a she-monkey surrounded by a number of monkeys. They were all stoning it, because it had committed illegal sexual intercourse. I too, stoned it along with them