Musnad Ahmad 27:1950

Sulayman ibn Dawud narrated to us, Ishaq ibn Sa'id al-Qurashi narrated to us, from his father, who said: I was with Ibn Umar, and a man came to him and said: "From whom are you?" He said: "From Aslam." He said: "Shall I not give you glad tidings, O brother of Aslam? I heard the Messenger of Allah, may Allah bless him and grant him peace, say: 'Ghifar, may Allah forgive them, and Aslam, may Allah grant them peace.'"