Ibn al-Hanzaliya, one of the Prophet’s Companions, reported the Prophet as saying, “Khuraim al-Asadi would be a fine man were it not for the length of his hair which reaches the shoulders and the way he lets his lower garment hang down.” When Khuraim heard that he took a knife and cut his hair in line with his ears, and he raised his lower garment halfway up his legs.
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.
Anas said he had a hanging lock of hair and his mother told him not to cut it, for God’s messenger used to stretch it out and hold it.
Abu Dawud transmitted it.
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.