Musannaf Ibn Abi Shayba 22:168

Yazid ibn Harun narrated to us, he said: Jarir informed us, he said: Sulayman ibn Sharhabil al-Khawlani narrated to us, he said: I heard Abu Umamah saying: "Recite the Quran, and let not these suspended codices (mushafs) deceive you, for indeed Allah will not punish a heart that has contained the Quran."