Sahih Bukhari Volume 5, Book 57, Hadith Number 103.

Narated By Masruq : ‘Abdullah (bin Mas’ud) was mentioned before ‘Abdullah bin ‘Amr. The latter said, “That is a man I continue to love because I heard Allah’s Apostle saying, ‘ Learn the recitation of the Qur’an from (any of these) four persons: ‘Abdullah bin Masud, Salim the freed slave of Abu Hudhaifa, Ubai bin Kab, and Muadh bin Jabal.” I do not remember whether he mentioned Ubai first or Muadh.