Musnad Abu Ya'la al-Mawsili 3:237

Wahb ibn Baqiyyah al-Wasiti narrated to us, Khalid narrated to us, from Mutarrif, from Abu Ishaq, from al-Harith, from Ali, from the Prophet (peace and blessings of Allah be upon him): That he forbade a man from raising his voice with the Quran before the night prayer (al-atamah) and after it, lest he confuse his companions while the people are praying.