The Messenger of Allah ﷺ sent a man in charge of an expedition and he would recite for his Companions during their prayer, ending (recitation) with:" Say, He is God, One." When they returned mention was made of it to the Messenger of Allah ﷺ. He (the Holy Prophet) told them to ask him why he had done like that. So they asked him and he said: Verily, it is an attribute of the Compassionate One, and (for this reason) I love to recite it. The Messenger of Allah ﷺ thereupon said: Inform him that Allah loves him.
عَنْ أُمِّهِ عَمْرَةَ بِنْتِ عَبْدِ الرَّحْمَنِ وَكَانَتْ فِي حَجْرِ عَائِشَةَ زَوْجِ النَّبِيِّ ﷺ عَنْ عَائِشَةَ أَنَّ رَسُولَ اللَّهِ ﷺ بَعَثَ رَجُلاً عَلَى سَرِيَّةٍ وَكَانَ يَقْرَأُ لأَصْحَابِهِ فِي صَلاَتِهِمْ فَيَخْتِمُ بِ { قُلْ هُوَ اللَّهُ أَحَدٌ} فَلَمَّا رَجَعُوا ذُكِرَ ذَلِكَ لِرَسُولِ اللَّهِ ﷺ فَقَالَ سَلُوهُ لأَىِّ شَىْءٍ يَصْنَعُ ذَلِكَ فَسَأَلُوهُ فَقَالَ لأَنَّهَا صِفَةُ الرَّحْمَنِ فَأَنَا أُحِبُّ أَنْ أَقْرَأَ بِهَا فَقَالَ رَسُولُ اللَّهِ ﷺ أَخْبِرُوهُ أَنَّ اللَّهَ يُحِبُّهُ