Musnad Ahmad 30:2934

'Abd al-Rahman narrated to us, he said: Shu'bah and Abu Dawud narrated to us, he said: Shu'bah informed us, the meaning [is the same], except that he said: He heard Abu al-Qasim, from Muhammad ibn Ziyad, he said: I heard Abu Hurayrah narrating from the Prophet, may Allah bless him and grant him peace, he said: "Aslam, may Allah keep it safe, and Ghifar, may Allah forgive it."