According to Ibn Mas'ud, Muhammad's top teacher of the Qur'an, Muslims are to "avoid copying the Mushaf and recitation" of Zaid ibn Thabit. Unfortunately, that's all Muslims have today!
Jami At-Tirmidhi 3104--Az-Zuhri said: "Ubaidullah bin Abdullah bin Utbah informed me that Abdullah bin Mas'ud disliked Zaid bin Thabit copying the Musahif, and he said: 'O you Muslim people! Avoid copying the Mushaf and recitation of this man. By Allah! When I accepted Islam he was but in the loins of a disbelieving man'--meaning Zaid bin Thabit--and it was regarding this that Abdullah bin Mas'ud said: 'O people of Al-Iraq! Keep the Musahif that are with you, and conceal them. For indeed Allah said: And whoever conceals something, he shall come with what he concealed on the Day of Judgement. So meet Allah with the Musahif.'"