From Sahih Muslim (Hadith 4679):
It has been narrated on the authority of Anas b. Malik that eighty Persons from the inhabitants of Mecca swooped down upon the Messenger of Allah (ﷺ) from the mountain of Tan'im. They were armed and wanted to attack the Prophet (ﷺ) and his Companions unawares. He (the Holy Prophet) captured them but spared their lives. So, God, the Exalted and Glorious, revealed the verses:" It is He Who restrained your hands from them and their hands from you in the valley of Mecca after He had given you a victory over them
Reference: Muslim 4679