Musnad Ahmad 1030:3

Abu Amir narrated to us, Abbad—meaning Ibn Rashid—narrated to us, from al-Hasan, from a man from Banu Sulayt, that he passed by the Messenger of Allah (peace and blessings of Allah be upon him) while he was sitting at the door of his mosque, sitting with his legs drawn up to his abdomen (ihtiba'), wearing a garment of Qatr (a type of striped cloth), with no other garment on him. He was saying: "The Muslim is the brother of the Muslim; he does not wrong him, nor does he forsake him." Then he pointed with his hand to his chest, saying: "Taqwa (piety/fear of Allah) is here, Taqwa is here."