ENOfficial
It was narrated from 'Amr bin Sh'uaib from his father, that his grandfather said: "The Messenger of Allah(ﷺ) forbade plucking out white hairs and said: 'It is the light of the believer.'"
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَبْدَةُ بْنُ سُلَيْمَانَ، عَنْ مُحَمَّدِ بْنِ إِسْحَاقَ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ نَهَى رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ عَنْ نَتْفِ الشَّيْبِ وَقَالَ " هُوَ نُورُ الْمُؤْمِنِ " .
sunnah.com