Musnad Ahmad 30:1520

Hassan ibn Musa and Abu Kamil narrated to us, they said: Hammad ibn Salamah narrated to us, from Muhammad ibn Amr ibn Alqamah, from Abu Salamah, from Abu Hurairah, that the Prophet, may Allah bless him and grant him peace, said: "The two sons of Al-Aas are believers," [referring to] Hisham and Amr.