On the prohibition against plucking out white hair from the beard and head, and against a young man plucking out the hair of his beard when it first appears

Riyad as-Salihin (The Meadows of the Righteous)

by Imam Nawawi

297. Chapter: On the prohibition against plucking out white hair from the beard and head, and against a young man plucking out the hair of his beard when it first appears

1646. 'Amr ibn Shu'ayb reported from his grandfather that the Prophet, may Allah bless him and grant him peace, said, "Do not pluck out white hair. It will be the light of a Muslim on the Day of Rising." [at-Tirmidhi]

1647. 'A'isha reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "Anyone who does an action which we have not commanded will be rejected." [Muslim]