Sunan Abi Dawud, Book 33, Hadith 4190 (USC-MSA) ⓘ
'Amr b. Shu'aib, on his father's authority, told that his grandfather reported the Messenger of Allah said: Do not pluck out grey hair. If any believer grows a grey hair in Islam, he will have light on the Day of Resurrection. (This is Sufyan's version). Yahya's version says: Allah will record on his behalf a good deed for it, and will blot out a sin for it.
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، ح وَحَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا سُفْيَانُ، - الْمَعْنَى - عَنِ ابْنِ عَجْلاَنَ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لاَ تَنْتِفُوا الشَّيْبَ مَا مِنْ مُسْلِمٍ يَشِيبُ شَيْبَةً فِي الإِسْلاَمِ " . قَالَ عَنْ سُفْيَانَ " إِلاَّ كَانَتْ لَهُ نُورًا يَوْمَ الْقِيَامَةِ " . وَقَالَ فِي حَدِيثِ يَحْيَى " إِلاَّ كَتَبَ اللَّهُ لَهُ بِهَا حَسَنَةً وَحَطَّ عَنْهُ بِهَا خَطِيئَةً " .
also referenced under: Hadith 4202 (DarusSalam) & Hadith 4190 (Hasan)