Ka'b b. 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 Nasa’i transmitted it.
‘Amr b. Shu'aib, on his father’s authority, told that his grandfather reported God’s messenger as saying. “Do not pluck out grey hairs, for they are the Muslim’s light. If anyone grows a grey hair in Islam God will record on his behalf a good deed for it, will blot out a sin for it, and raise him a degree for it.”
Abu Dawud transmitted it.
God’s messenger and I used to wash from one vessel; and he had hair which did not reach the shoulder but which came lower than the ear.
Tirmidhi transmitted it.
Abu Huraira reported God’s messenger as saying, “Change grey hairs and do not copy the Jews.”
Tirmidhi transmitted it, and Nasa’i transmitted it on the authority of Ibn ‘Umar and az-Zubair.