Abdur Rahman bin Mahdi عبد الرحمن بن مهدي · Chapters on The Virtues of the Qur'an

that the Messenger of Allah (ﷺ) came out to Ubayy bin Ka'b, and the Messenger of Allah (ﷺ) said: "O Ubayy!" And he was performing Salat, so Ubayy turned around but he did not respond to him, so Ubayy finished his Salat quickly. Then he turned to the Messenger of Allah (ﷺ) and said: 'As-Salamu 'Alaikum, O Messenger of Allah!' The Messenger of Allah (ﷺ) said: 'Wa 'Alaikum As-Salam - what prevented you from responding to me when I called…

that the Messenger of Allah (ﷺ) said: "He does not believe in the Qur'an who makes lawful what it prohibits."