عن جابر رضي الله عنه قال: أُتِيَ بأبي قُحَافَة والد أبي بكر الصديق رضي الله عنهما ، يوم فتح مكة ورأسه ولحيته كَالثَّغَامَةِ بياضًا. فقال رسول الله صلى الله عليه وسلم : «غَيِّرُوا هذا واجْتَنِبوا السَّواد».
[صحيح] - [رواه مسلم]
Jābir (may Allah be pleased with him) reported: Abu Quhāfah, father of Abu Bakr As-Siddīq (may Allah be pleased with him), was brought on the day of the Conquest of Makkah with his head and beard as white as Thaghāmah (a white plant). Therefore, the Messenger of Allah (may Allah’s peace and blessings be upon him) said: "Change this and avoid black."
Sahih/Authentic. - [Muslim]
On the day of the Conquest of Makkah, Abu Quhāfah, father of Abu Bakr As-Siddīq, was brought to the Prophet (may Allah's peace and blessings be upon him) and his head and beard were as white as an intensely white plant called Thaghāmah. When the Prophet (may Allah's peace and blessings be upon him) saw him, he said: “Change this and avoid black.” He ordered that his white hair be dyed with anything other than black, because black makes an old person look younger, and this is a challenge to the natural constitution that Allah gives to man. Red, yellow, and henna mixed with katam-dye are fine to use, so long as black is excluded. If the synthesized dye is something between red and black, it is fine. In a Hadīth by Anas (may Allah be pleased with him), Abu Bakr and ‘Umar (may Allah be pleased with him) dyed their hair with henna and katam-dye.