Musannaf Ibn Abi Shayba 27:830

Ibn Abi ‘Adi narrated to us, from ‘Awf, from Khulayd al-‘Asari, who said: When Salman arrived to us, we came to him to have him recite [the Quran] to us. He said: "Indeed, the Quran is Arabic, so have it recited in Arabic." Zayd ibn Sawhan used to recite to us, and whenever he made a mistake, Salman would correct him, and whenever he got it right, he would say: "By Allah."