Imam Al-Nawawi’s Riyad-us-Saliheen
Prohibition of Plucking Grey Hairs
1646. Reported `Amr bin Shu`aib, on the authority of his father and grandfather that the Prophet (sallallaahu alayhi wa sallam) said, “Do not pluck out grey hair, for they are the Muslim’s light on the Day of Resurrection.”
[Abu Dawud, At-Tirmidhi and An-Nasa’i].
1647. `Aishah (May Allah be pleased with her) said: The Messenger of Allah (sallallaahu alayhi wa sallam) said, “He who does something contrary to our way (i.e., Islam) will have it rejected.”