Musannaf Ibn Abi Shayba 3:1846

Ibn Fudayl narrated to us, from ‘Ata’ ibn al-Sa’ib, from Abu ‘Abd al-Rahman, who said: Salman al-Farisi entered the mosque, and there were people in it reciting. They recited the prostration (verse) and prostrated. His companion said to him, "O Abu ‘Abd Allah, if only we had come to these people." He said, "It is not for this that we came out early."