Yahya related to me from Malik from Abu Nuaym Wahb ibn Kaysanthat he heard Jabir ibn Abdullah say, "Someone who prays a rakawithout reciting the umm al-Qur'an in it has not done the prayerexcept behind an imam."
App reference: Book 3, Hadith 40
USC-MSA web (English) reference: Book 3, Hadith 40
Arabic reference: Book 3, Hadith 187