Ibn ‘Umar said that God’s messenger had his head shaved at the Farewell Pilgrimage, as did some of his companions, but some had their hair clipped. Bukhari and Muslim.
Hadith Referenceمشكوة المصابيح / كتاب المناسك / 2646
Hadith Gradingالألبانی:مُتَّفق عَلَيْهِ | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (1726) و مسلم (322 /1304)»