That he had long thick hair. "He asked the Prophet (about it) and he told him to take care of it and comb it every day."
Sunan an-Nasa'i Book 48, Hadith 198
← Previous Hadith "The Prophet came to us and saw a man with wild hair. He said: 'Could this man not find anything with which to calm down his hair?'"

Sunan an-Nasa'i Book 48, Hadith 197 Next Hadith → The Messenger of Allah parted his hair after that.

Sunan an-Nasa'i Book 48, Hadith 199