Reported 'Amr bin Shu'aib, on the authority of his father and grandfather that the Prophet (ﷺ) 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].
App reference: Book 18, Hadith 136
Arabic/English book reference: Book 18, Hadith 1646