Ubayy b. Ka'b said: The Messenger of Allah (ﷺ) said: Abu al-Mundhir, which verse of Allah's Book that you have is creates ? I replied: Allah and His Apostle know best. He said: Abu al-Mundhir, which verse of Allah's that you have is greatest ? I said: Allah, there is no god but He, the Living, the Eternal. Thereupon he struck me on the beast and said: May knowledge be pleasant for you, Abu al-Mundhir.