From Sahih Bukhari (Hadith 4284):
Narrated Abu Huraira:Allah's Messenger (ﷺ) said, "If Allah makes us victorious, our encamping place will be Al-Khaif, the place where the infidels took an oath to be loyal to Heathenism (by boycotting Banu Hashim, the Prophet's folk)
Reference: Bukhari 4284