Qatadah (may Allah have mercy on him) says: I asked Anas (may Allah be pleased with him), "Did the Prophet (peace and blessings of Allah be upon him) use dye?" He replied, "That situation never arose; the Prophet (peace and blessings of Allah be upon him) had only a few white hairs at his temples. However, Abu Bakr as-Siddiq (may Allah be pleased with him) used to dye his hair with henna and katam."