Musnad Ahmad 805:4

Hashim narrated to us, Ali bin Zaid informed us, Al-Hasan narrated to us, he said: And a man from Banu Sulayt informed me, he said: I was raised to the Messenger of Allah, may Allah bless him and grant him peace, and I heard him saying: "The Muslim is the brother of the Muslim; he does not wrong him, and he does not forsake him. Taqwa (piety/fear of Allah) is here, Taqwa is here," two or three times, and he pointed with his hand to his chest.