It is narrated from Sayyiduna Khuraym bin Fatik (may Allah be pleased with him); he said: The Messenger of Allah (peace and blessings be upon him) said: "What a fine man you would be, were it not for two traits in you!" I said: "O Messenger of Allah! What are they?" He (peace and blessings be upon him) said: "You let your lower garment hang down (below the ankles) and you let your hair grow long." I said: "Then I will not do it again." The narrator says: So he cut his hair and raised his lower garment.
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 4141