Musnad Abu Ya'la al-Mawsili 3:264

Dāwūd ibn ‘Amr al-Ḍabbī narrated to us, Sufyān narrated to us, Ibn Abī Laylā narrated to us, from ‘Amr ibn Murrah, from ‘Abd Allāh ibn Salamah, from ‘Alī: That the Prophet (may God bless him and grant him peace) would not be prevented from reciting the Qur’an except when he was in a state of major ritual impurity (junub).