from his father, from his grandfather: "The Prophet ﷺ prohibited plucking gray hair. And he said: "It is the Muslim's light.'"  

أَنَّ النَّبِيَّ ﷺ نَهَى عَنْ نَتْفِ الشَّيْبِ وَقَالَ إِنَّهُ نُورُ الْمُسْلِمِ قَالَ هَذَا حَدِيثٌ حَسَنٌ قَدْ رُوِيَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ الْحَارِثِ وَغَيْرِ وَاحِدٍ عَنْ عَمْرِو بْنِ شُعَيْبٍ