Another of them was Ubayy ibn Ka`b

Under category: How He treated them?

As has preceded, the Prophet of Allah, sallallaahu ‘alayhi wa sallam,
said that the Quran should be learned from four people, and mentioned among them Ubayy ibn Ka`b. `Umar ibn Al-Khattaab said: “`Ali is the best judge among us, and Ubayy is the most knowledgeable in reading the Quran among us.”