Thabit told that when Anas was asked whether the Prophet dyed his hair he replied, "If I had wanted to count the hoary hairs which were on his head I could have done so,” adding that he did not dye his hair. In a version he added that Abu Bakr dyed his hair with henna and katam, and ‘Umar dyed it with henna alone. (Bukhari and Muslim.)
Hadith Referenceمشكوة المصابيح / كتاب اللباس / 4478
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 (5895) و مسلم (103/ 2341)»