Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai-kubra:10472 – Qutaybah b. Saʿīd > Abū ʿAwānah > Muhājir Abū al-Ḥasan

[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.'"  

الكبرى للنسائي:١٠٤٧٢ – أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ قَالَ حَدَّثَنَا أَبُو عَوَانَةَ عَنْ مُهَاجِرٍ أَبِي الْحَسَنِ

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»  

See similar narrations below:

Collected by Aḥmad, Nasāʾī's Kubrá
ahmad:16617 – al-Aswad b. ʿĀmir > Sharīk > Muhājir al-Ṣāʾigh

[Machine] A man, who was not mentioned by the Prophet's companions that he had heard a man, meaning the Prophet, reciting "Say, O disbelievers," said, "As for this, it means that he has been cleared of polytheism," and he heard another reciting "Say, He is Allah, the One." So he said, "As for this, he has been forgiven."  

أحمد:١٦٦١٧ – حَدَّثَنَا الْأَسْوَدُ بْنُ عَامِرٍ قَالَ حَدَّثَنَا شَرِيكٌ عَنْ مُهَاجِرٍ الصَّائِغِ

عَنْ رَجُلٍ لَمْ يُسَمِّهِ مِنْ أَصْحَابِ النَّبِيِّ ﷺ أَنَّهُ سَمِعَ رَجُلًا يَعْنِي النَّبِيَّ ﷺ يَقْرَأُ قُلْ يَا أَيُّهَا الْكَافِرُونَ قَالَ أَمَّا هَذَا فَقَدْ بَرِئَ مِنَ الشِّرْكِ وَسَمِعَ آخَرَ يَقْرَأُ قُلْ هُوَ اللهُ أَحَدٌ فَقَالَ أَمَّا هَذَا فَقَدْ غُفِرَ لَهُ  

nasai-kubra:7974 – Qutaybah b. Saʿīd > Abū ʿAwānah > Muhājir Abū al-Ḥasan

A man from the companions of Prophet Muhammad ﷺ narrated: I was traveling with the Prophet ﷺ when I heard a man reciting "Say: O disbelievers!" (Kāfirūn, 109:1) until he completed it. The Prophet ﷺ said, "He has been absolved from committing shrik (associating partners with Allah.)" Then we continued our journey and heard another person reciting "Say: He is Allah, the One." (Ikhlāṣ 112:1) The Prophet ﷺ said, "As for this person, his sins have been forgiven."  

الكبرى للنسائي:٧٩٧٤ – أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ قَالَ حَدَّثَنَا أَبُو عَوَانَةَ عَنْ مُهَاجِرٍ أَبِي الْحَسَنِ

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