Sahih Muslim
The Book Pertaining to the Excellent Qualities of the Holy Prophet (may Peace be upon them) and His Companions (Kitab Al-Fadail)
Book Number: 030 / Hadith Number: 5786
Abu Juhaifa reported: I saw Allah's Messenger (may peace be upon him) that he had white complexion and had some white hair, and Hasan b. 'Ali resembled him.