Sahih Muslim Book - 6, Hadith - 1890

حَدَّثَنَا أَحْمَدُ بْنُ عَبْدِ الرَّحْمَنِ بْنِ وَهْبٍ حَدَّثَنَا عَمِّى عَبْدُ اللَّهِ بْنُ وَهْبٍ حَدَّثَنَا عَمْرُو بْنُ الْحَارِثِ عَنْ سَعِيدِ بْنِ أَبِى هِلاَلٍ أَنَّ أَبَا الرِّجَالِ مُحَمَّدَ بْنَ عَبْدِ الرَّحْمَنِ حَدَّثَهُ عَنْ أُمِّهِ عَمْرَةَ بِنْتِ عَبْدِ الرَّحْمَنِ وَكَانَتْ فِى حَجْرِ عَائِشَةَ زَوْجِ النَّبِىِّ -صلى الله عليه وسلم- عَنْ عَائِشَةَ أَنَّ رَسُولَ اللَّهِ -صلى الله عليه وسلم- بَعَثَ رَجُلاً عَلَى سَرِيَّةٍ وَكَانَ يَقْرَأُ لأَصْحَابِهِ فِى صَلاَتِهِمْ فَيَخْتِمُ بِ (قُلْ هُوَ اللَّهُ أَحَدٌ) فَلَمَّا رَجَعُوا ذُكِرَ ذَلِكَ لِرَسُولِ اللَّهِ -صلى الله عليه وسلم- فَقَالَ « سَلُوهُ لأَىِّ شَىْءٍ يَصْنَعُ ذَلِكَ ». فَسَأَلُوهُ فَقَالَ لأَنَّهَا صِفَةُ الرَّحْمَنِ فَأَنَا أُحِبُّ أَنْ أَقْرَأَ بِهَا. فَقَالَ رَسُولُ اللَّهِ -صلى الله عليه وسلم- « أَخْبِرُوهُ أَنَّ اللَّهَ يُحِبُّهُ ».

It was narrated from 'Amrah bint 'Abdur-Rahman, who was under the care of 'Aishah, the wife of the Prophet (s.a.w), that the Messenger of Allah (s.a.w) sent a man in charge of a raiding party, and he used to recite for his companions when leading them in prayer, and he would end with: "Say: He is Allah, (the) One)". When they came back, they mentioned that to the Messenger of Allah (s.a.w) and he said: "Ask him why he does that." So they asked him and he said: "Because it is a description of the Most Merciful and I love to recite it." The Messenger of Allah (s.a.w) said: "Tell him that Allah loves him."