Abu Hurairah Radhiallahu 'Anhu was asked:
"Did Rasulullah Sallallhu 'Alayhi Wasallam use a dye?" (for his hair). He replied: "Yes." (JA)
English reference (JA): Book 6, Hadith 45 (JA)
Arabic reference (JA): Book 6, Hadith 46 (JA)