Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
muslim:810 – Abū Bakr b. Abū Shaybah > ʿAbd al-Aʿlá b. ʿAbd al-Aʿlá > al-Jurayrī > Abū al-Salīl > ʿAbdullāh b. Rabāḥ al-Anṣārī > Ubay b. Kaʿb

Messenger of Allah ﷺ said: O Abu' al-Mundhir, do you know the verse from the Book of Allah which, according to you, is the greatest? I said: Allah and His Apostle ﷺ know best. He again said: Abu'l-Mundhir, do you know the verse from the Book of Allah which, according to you, is the greatest? I said: Allah, there is no god but He, the Living, the Eternal. Thereupon he struck me on my breast and said: May knowledge be pleasant for you, O Abu'l-Mundhir!  

مسلم:٨١٠ – حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ حَدَّثَنَا عَبْدُ الأَعْلَى بْنُ عَبْدِ الأَعْلَى عَنِ الْجُرَيْرِيِّ عَنْ أَبِي السَّلِيلِ عَنْ عَبْدِ اللَّهِ بْنِ رَبَاحٍ الأَنْصَارِيِّ عَنْ أُبَىِّ بْنِ كَعْبٍ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ يَا أَبَا الْمُنْذِرِ أَتَدْرِي أَىُّ آيَةٍ مِنْ كِتَابِ اللَّهِ مَعَكَ أَعْظَمُ قَالَ قُلْتُ اللَّهُ وَرَسُولُهُ أَعْلَمُ قَالَ يَا أَبَا الْمُنْذِرِ أَتَدْرِي أَىُّ آيَةٍ مِنْ كِتَابِ اللَّهِ مَعَكَ أَعْظَمُ قَالَ قُلْتُ اللَّهُ لاَ إِلَهَ إِلاَّ هُوَ الْحَىُّ الْقَيُّومُ قَالَ فَضَرَبَ فِي صَدْرِي وَقَالَ وَاللَّهِ لِيَهْنِكَ الْعِلْمُ أَبَا الْمُنْذِرِ  

See similar narrations below:

Collected by Abū Dāwūd, Ḥākim, Suyūṭī
abudawud:1460 – Muḥammad b. al-Muthanná > ʿAbd al-Aʿlá > Saʿīd b. Iyās > Abū al-Salīl > ʿAbdullāh b. Rabāḥ al-Anṣārī > Ubay b. Kaʿb

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.  

أبو داود:١٤٦٠ – حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى حَدَّثَنَا عَبْدُ الأَعْلَى حَدَّثَنَا سَعِيدُ بْنُ إِيَاسٍ عَنْ أَبِي السَّلِيلِ عَنْ عَبْدِ اللَّهِ بْنِ رَبَاحٍ الأَنْصَارِيِّ عَنْ أُبَىِّ بْنِ كَعْبٍ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ أَبَا الْمُنْذِرِ أَىُّ آيَةٍ مَعَكَ مِنْ كِتَابِ اللَّهِ أَعْظَمُ قَالَ قُلْتُ اللَّهُ وَرَسُولُهُ أَعْلَمُ قَالَ أَبَا الْمُنْذِرِ أَىُّ آيَةٍ مَعَكَ مِنْ كِتَابِ اللَّهِ أَعْظَمُ قَالَ قُلْتُ { اللَّهُ لاَ إِلَهَ إِلاَّ هُوَ الْحَىُّ الْقَيُّومُ } قَالَ فَضَرَبَ فِي صَدْرِي وَقَالَ لِيَهْنِ لَكَ يَا أَبَا الْمُنْذِرِ الْعِلْمُ  

hakim:5326 – Abū ʿAbdullāh Muḥammad b. Yaʿqūb al-Ḥāfiẓ > Ibrāhīm b. ʿAbdullāh > Yazīd b. Hārūn > Saʿīd b. Iyās al-Jurayrī > Abū al-Salīl > ʿAbdullāh b. Rabāḥ > Ubay b. Kaʿb

[Machine] The Messenger of Allah ﷺ said: "Abu Mundhir, which verse in the Book of Allah do you see as the greatest?" Abu Mundhir replied, "I said, 'Allah! There is no deity except Him, the Ever-Living, the Sustainer of existence.'" The Prophet then struck his chest and said, "May knowledge bring you joy, Abu Mundhir."  

الحاكم:٥٣٢٦ – حَدَّثَنَا أَبُو عَبْدِ اللَّهِ مُحَمَّدُ بْنُ يَعْقُوبَ الْحَافِظُ ثَنَا إِبْرَاهِيمُ بْنُ عَبْدِ اللَّهِ ثَنَا يَزِيدُ بْنُ هَارُونَ أَنَا سَعِيدُ بْنُ إِيَاسٍ الْجُرَيْرِيُّ عَنْ أَبِي السَّلِيلِ عَنْ عَبْدِ اللَّهِ بْنِ رَبَاحٍ عَنْ أُبَيِّ بْنِ كَعْبٍ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ «أَبَا الْمُنْذِرِ أَيُّ آيَةٍ فِي كِتَابِ اللَّهِ أَعْظَمَ مَعَكَ؟» قَالَ قُلْتُ {اللَّهُ لَا إِلَهَ إِلَّا هُوَ الْحَيُّ الْقَيُّومُ} [البقرة 255] قَالَ فَضَرَبَ صَدْرِي وَقَالَ «لِيَهْنِكَ الْعِلْمُ أَبَا الْمُنْذِرِ»  

هَذَا حَدِيثٌ صَحِيحُ الْإِسْنَادِ وَلَمْ يُخَرِّجَاهُ صحيح
suyuti:22-109b – Uba > al-Nabi ﷺ > Lah Āyah Kitāb Allāh Aʿẓam > Qult
Request/Fix translation

  

السيوطي:٢٢-١٠٩b –

" عَنْ أُبَىٍّ أَنَّ النَّبِىَّ ﷺ قَالَ لَهُ: أىُّ آيَةٍ كِتَابِ الله أَعْظَمُ؟ قَالَ: قُلْتُ: الله وَرَسُولُهُ أعَلمُ حَتَّى أَعَادَها عَلَيْهِ ثَلاَثًا، ثُمَّ قُلْتُ: {اللَّهُ لَا إِلَهَ إِلَّا هُوَ الْحَيُّ الْقَيُّومُ} (*) فَضَرَبَ صَدْرِى وَقَال: لَيَهْنِكَ الْعِلْمُ أَبَا الْمُنْذِرِ".  

[ط] الطيالسي