Mishkat al-Masabih 8 The Excellent Qualities of the Qur’an كتاب فضائل القرآن 20

وَعَنْ عَائِشَةَ: أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بَعَثَ رَجُلًا عَلَى سَرِيَّةٍ وَكَانَ يَقْرَأُ لأَصْحَابه فِي صلَاتهم فيختم ب (قل هُوَ اللَّهُ أَحَدٌ) فَلَمَّا رَجَعُوا ذَكَرُوا ذَلِكَ لِلنَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ: «سَلُوهُ لِأَيِّ شَيْءٍ يَصْنَعُ ذَلِكَ» فَسَأَلُوهُ فَقَالَ لِأَنَّهَا صفة الرَّحْمَن وَأَنا أحب أَن أَقرَأ بِهَا فَقَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أَخْبِرُوهُ أَن الله يُحِبهُ»

‘Ā’isha said that the Prophet sent a man in charge of an expedition and he would recite for his companions during their prayer, finishing with “Say, He is God, One.” When they returned they mentioned that to the Prophet, and he told them to ask him why he did that. They asked him and he replied, “Because it is a description of the Compassionate One, and I like to recite it.” Then the Prophet said, “Tell him that God loves him.” (Bukhārī and Muslim.)