"I heard Abu Hurairah say: 'I came back (from a journey) with the Messenger of Allah ﷺ and he heard a man reciting 'Say: He is Allah, (the) One, Allah-us-Samad (the Self-Sufficient Master). He begets not, nor was He begotten. And there is none equal or comparable unto Him.' The Messenger of Allah ﷺ said: 'It is guaranteed.' We asked him: 'What, O Messenger of Allah?' He said: 'Paradise.'" (Using translation from Nasāʾī 994)  

سَمِعْتُ أَبَا هُرَيْرَةَ يَقُولُ أَقْبَلْنَا مَعَ رَسُولِ اللهِ ﷺ فَسَمِعَ رَجُلًا يَقْرَأُ {قُلْ هُوَ اللهُ أَحَدٌ اللهُ الصَّمَدُ لَمْ يَلِدْ وَلَمْ يُولَدْ وَلَمْ يَكُنْ لَهُ كُفُوًا أَحَدٌ} [الإخلاص 2] فَقَالَ رَسُولُ اللهِ ﷺ «وَجَبَتْ» فَسَأَلْتُهُ مَاذَا يَا رَسُولَ اللهِ؟ فَقَالَ «الْجَنَّةُ»  

The Prophet ﷺ sent (an army unit) under the command of a man who used to lead his companions in the prayers and would finish his recitation with (the Sura 112): 'Say (O Muhammad): "He is Allah, the One." ' (112.1) When they returned (from the battle), they mentioned that to the Prophet. He said (to them), "Ask him why he does so." They asked him and he said, "I do so because it mentions the qualities of the Beneficent and I love to recite it (in my prayer)." The Prophet; said (to them), "Tell him that Allah loves him." (Using translation from Bukhārī 7375)   

أَنَّ رَسُولَ اللهِ ﷺ بَعَثَ رَجُلًا عَلَى سَرِيَّةٍ وَكَانَ يَقْرَأُ لِأَصْحَابِهِ فِي صَلَاتِهِمْ فَيَخْتِمُ بِ {قُلْ هُوَ اللهُ أَحَدٌ} [الإخلاص 1] فَلَمَّا رَجَعُوا ذَكَرُوا ذَلِكَ لِرَسُولِ اللهِ ﷺ فَقَالَ «سَلُوهُ لِأَيِّ شَيْءٍ صَنَعَ ذَلِكَ؟» فَسَأَلُوهُ فَقَالَ إِنَّهَا صِفَةُ الرَّحْمَنِ فَأَنَا أُحِبُّ أَنْ أَقْرَأَ بِهَا قَالَ رَسُولُ اللهِ ﷺ «أَخْبِرُوهُ أَنَّ اللهَ يُحِبُّهُ»  

[Machine] A man from the companions of the Prophet ﷺ said, "I was walking with the Prophet ﷺ when I heard a man reciting, 'Say, O disbelievers' [Surah Al-Kafirun 1], until he finished it. The Prophet ﷺ said, 'This has absolved him of shirk (associating partners with Allah).' Then we continued walking and heard another man reciting, 'Say, He is Allah, [who is] One' [Surah Al-Ikhlas 1]. The Prophet ﷺ said, 'As for this, he has been forgiven.'"  

عَنْ رَجُلٍ مِنْ أَصْحَابِ النَّبِيِّ ﷺ قَالَ كُنْتُ أَسِيرُ مَعَ النَّبِيِّ ﷺ فَسَمِعَ رَجُلًا يَقْرَأُ {قُلْ يَا أَيُّهَا الْكَافِرُونَ} [الكافرون 1] حَتَّى خَتَمَهَا فَقَالَ «قَدْ بَرِئَ هَذَا مِنَ الشِّرْكِ» ثُمَّ سِرْنَا فَسَمِعَ آخَرَ يَقْرَأُ {قُلْ هُوَ اللهُ أَحَدٌ} [الإخلاص 1] فَقَالَ «أَمَّا هَذَا فَقَدْ غُفِرَ لَهُ»  

[Machine] We were with the Messenger of Allah ﷺ on a journey, and as we were walking, a man from the group recited "Say, 'O disbelievers...'" (Surah Al-Kafirun, verse 1). The Messenger of Allah ﷺ said, "As for your companion, he has been acquitted of polytheism." So I went to see who it was and gave him the good news. Then another man recited "Say, 'He is Allah, [who is] One...'" (Surah Al-Ikhlas, verse 1). The Messenger of Allah ﷺ said, "As for your companion, his sins have been forgiven."  

كُنَّا مَعَ رَسُولِ اللهِ ﷺ فِي سَفَرٍ وَنَحْنُ نَسِيرُ فَقَرَأَ رَجُلٌ مِنَ الْقَوْمِ {قُلْ يَا أَيُّهَا الْكَافِرُونَ} [الكافرون 1] قَالَ رَسُولُ اللهِ ﷺ «أَمَّا صَاحِبُكُمْ فَقَدْ بَرِئَ مِنَ الشِّرْكِ» فَذَهَبْتُ أَنْظُرُ مَنْ هُوَ فَأُبَشِّرُهُ فَقَرَأَ رَجُلٌ آخَرُ {قُلْ هُوَ اللهُ أَحَدٌ} [الإخلاص 1] قَالَ رَسُولُ اللهِ ﷺ «أَمَّا صَاحِبُكُمْ فَقَدْ غُفِرَ لَهُ»