Hadith: Do not pluck out grey hair, for it is the light of the Muslim on the Day of Judgment

عن عمرو بن شعيب، عن أبيه، عن جده رضي الله عنه عن النبي صلى الله عليه وسلم قال: «لا تَنْتِفُوا الشَّيْبَ؛ فإنه نُور المسلم يوم القيامة».
[صحيح] - [رواه أبو داود والترمذي وأحمد وابن ماجه والنسائي]

‘Amr ibn Shu‘ayb (may Allah be pleased with him) reported from his father and grandfather that the Prophet (may Allah's peace and blessings be upon him) said: "Do not pluck out grey hair, for it is the light of the Muslim on the Day of Judgment.”
[Authentic hadith] - [Narrated by Ibn Majah - Narrated by At-Termedhy - An-Nasaa’i - Narrated by Abu Daoud]

Explanation

The Prophet (may Allah's peace and blessings be upon him) forbade plucking grey hairs, whether they are on one's head or beard or any other place on the body, as this grey hair will be light for the person on the Day of Judgment.