وَعَنْ كَعْبِ بْنِ مُرَّةَ عَنْ
رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «مَنْ شَابَ شَيْبَةً فِي الْإِسْلَامِ كَانَتْ لَهُ نُورًا يَوْمَ القيامةِ»
Kab ibn Murra reported God’s messenger as saying, “If anyone grows a grey hair in Islam it will be a light for him on the day of resurrection.” Tirmidhi and Nasai transmitted it.