Musnad Ahmad 937:116

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, from Sulayman, who said: I heard Sulayman ibn Mus-hir, from Kharashah ibn al-Hurr, from Abu Dharr, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said—and he mentioned the hadith. Ibn Ja'far said: "The one who reminds others of what he has given, and the one who lets his lower garment hang below his ankles."