Mishkat al-Masabih 8 The Excellent Qualities of the Qur’an كتاب فضائل القرآن 14

وَعَنْ أُبَيِّ بْنِ كَعْبٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «يَا أَبَا الْمُنْذِرِ أَتَدْرِي أَيُّ آيَةٍ مِنْ كِتَابِ اللَّهِ مَعَك أعظم؟» . قَالَ: قُلْتُ اللَّهُ وَرَسُولُهُ أَعْلَمُ قَالَ: «يَا أَبَا الْمُنْذِرِ أَتَدْرِي أَيُّ آيَةٍ مِنْ كِتَابِ اللَّهِ مَعَك أعظم؟» . قَالَ: قُلْتُ (اللَّهُ لَا إِلَهَ إِلَّا هُوَ الْحَيُّ القيوم) قَالَ فَضرب فِي صَدْرِي وَقَالَ: «وَالله لِيَهنك الْعلم أَبَا الْمُنْذر» . رَوَاهُ مُسلم

Ubayy b. Ka‘b said: God’s messenger asked, “Abul Mundhir (this is Ubayy’s Kunya), do you know which verse of God’s Book that you have is greatest?” I replied, “God and His messenger know best.” He repeated his question and I said, “God, there is no god but He, the Living, the Eternal.” Thereupon he struck me on the breast and said, “May knowledge be pleasant for you, Abul Mundhir!” Muslim transmitted it.