From Sahih Bukhari (Hadith 4999):
Narrated Masriq:`Abdullah bin `Amr mentioned `Abdullah bin Masud and said, "I shall ever love that man, for I heard the Prophet (ﷺ) saying, 'Take (learn) the Qur'an from four: `Abdullah bin Masud, Salim, Mu`adh and Ubai bin Ka`b
Reference: Bukhari 4999