Musannaf Ibn Abi Shayba 3:1245

Abu Bakr narrated to us, he said: Isma'il bin 'Ulayyah narrated to us, from al-Jurayri, from Ibn Buraydah, from 'Imran bin Husayn, who said: "A prayer is not valid in which the Opening of the Book (al-Fatiha) and two verses or more are not recited."