Musnad Abu Ya'la al-Mawsili 179:1

Ubayd Allah ibn Umar al-Qawariri narrated to us, Yahya ibn Sa'id narrated to us, Shu'bah narrated to us, he said: Khabib ibn Abd al-Rahman narrated to me, from Hafs ibn Asim, from Abu Sa'id ibn al-Mu'alla, who said: I was praying in the mosque, and the Messenger of Allah (peace be upon him) called me, but I did not answer him. I said to him: "O Messenger of Allah, I was praying." He said: "Has Allah not said: 'Respond to Allah and to the Messenger'?" Then he said to me: "Shall I not teach you a surah that is the greatest surah in the Quran?" He said: "[It is] 'All praise is due to Allah, Lord of the worlds,' [which is] from the seven oft-repeated verses and the Great Quran which I have been given."