Mishkat al-Masabih 8 The Excellent Qualities of the Qur’an كتاب فضائل القرآن 21

وَعَنْ أَنَسٍ قَالَ: إِنَّ رَجُلًا قَالَ: يَا رَسُولَ اللَّهِ إِنِّي أُحِبُّ هَذِهِ السُّورَةَ: (قُلْ هُوَ الله أحد) قَالَ: إِنَّ حُبَّكَ إِيَّاهَا أَدْخَلَكَ الْجَنَّةَ “. رَوَاهُ التِّرْمِذِيّ وروى البُخَارِيّ مَعْنَاهُ

Anas said a man told God’s messenger that he liked the sūra “Say, He is God, One,” to which he replied, “Your love of it will bring you into paradise.” Tirmidhī transmitted it and Bukhārī transmitted something to the same effect.