Musnad Ahmad 30:1214

Abu Sa’id, the freed slave of Banu Hashim, narrated to us, Hammad bin ‘Abbad as-Sadusi narrated to us, he said: I heard Abu al-Muhazzam narrating from Abu Hurairah: "That the Messenger of Allah (ﷺ) commanded that the 'Sama'at' (Surahs beginning with 'Sabbaha' or similar) be recited in the 'Isha prayer."