Musnad Ahmad 691:2

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from Abu Ishaq, from Shamir, from Khuraym, a man from Banu Asad, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Were it not for two things in you, you would be [a perfect person]." He said: "One is enough for me." He said: "You let your lower garment hang low, and you grow your hair long." He said: "Certainly, by Allah, I will not do [either of] them."