Musannaf Ibn Abi Shayba 36:382

'Affan narrated to us, he said: Hammad bin Salamah narrated to us, from Thabit, from Anas, that eighty men from the people of Makkah descended upon the Messenger of Allah from the mountain of al-Tan'im at the time of the dawn prayer. The Messenger of Allah, may Allah bless him and grant him peace, took them as captives, then he pardoned them. And the Qur'an was revealed: "And it is He who withheld their hands from you and your hands from them within [the valley of] Makkah after He let you overcome them."