Musannaf Ibn Abi Shayba 3:1229

Mu'awiyah ibn Hisham narrated to us, he said: Sufyan narrated to us, from Nusayr ibn Dhu'luq, from al-Rabi' ibn Khuthaym, that he used to recite in the Maghrib [prayer] from the short chapters of the Mufassal, and "Say, 'O disbelievers,'" and "Say, 'He is Allah, [who is] One.'"