Musannaf Ibn Abi Shayba 22:219

Hussain bin Ali narrated to us, from Za'idah, from Abdul-Malik bin Umair, from Qabisah, from Jabir, who said: "I have not seen anyone who was more of a reciter of the Book of Allah, nor more knowledgeable in the religion of Allah, nor more learned about Allah, than Umar."