Musnad Ahmad 691:4

Yahya ibn Adam narrated to us, Abu Bakr narrated to us, from Abu Ishaq, from Shamir ibn Atiyyah, from Khuraym ibn Fatik al-Asadi, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said to me: "You are an excellent man, O Khuraym, were it not for two traits in you." I said: "And what are they, O Messenger of Allah?" He said: "Your letting down of your lower garment, and your letting your hair grow long."