"O Ka'b bin Murrah! Relate (something) to is from the Messenger of Allah ﷺ, and be cautious. He said: 'I heard the Prophet ﷺ say: "Whoever develops some gray hair in Islam, it shall be a light from him on the Day of Judgement."  

حَدِّثْنَا عَنْ رَسُولِ اللَّهِ ﷺ وَاحْذَرْ قَالَ سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ مَنْ شَابَ شَيْبَةً فِي الإِسْلاَمِ كَانَتْ لَهُ نُورًا يَوْمَ الْقِيَامَةِ  

That the Messenger of Allah ﷺ said: "Whoever develops some gray hair in the cause of Allah, it shall be a light for him in the Day of Judgement. (Using translation from Tirmidhī 1635)   

قَالَ رَسُولُ اللَّهِ ﷺ «مَنْ شَابَ شَيْبَةً فِي الْإِسْلَامِ كَانَتْ لَهُ نُورًا يَوْمَ الْقِيَامَةِ»  

[Machine] I heard the Messenger of Allah ﷺ saying, "Whoever becomes gray-haired in Islam, it will be a light for him on the Day of Resurrection." And I will not change my gray hair.  

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ «مِنْ شَابَ شَيْبَةً فِي الْإِسْلَامِ كَانَتْ لَهُ نُورًا يَوْمَ الْقِيَامَةِ» وَمَا أَنَا بِمُغَيِّرٍ شَيْبَتِي  

"مَنْ شَابَ شَيبَةً في الإِسْلام كَانَتْ لَه نُورًا يَوْمَ القِيَامَة".