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
muslim:3025 – Abū Bakr b. Abū Shaybah And ʾIsḥāq b. Ibrāhīm And Aḥmad b. ʿAbdah al-Ḍabbī Wa-al-Lafẓ Ibn Abū Shaybah > al-Ākharān > Sufyān > ʿAmr > ʿAṭāʾ > Ibn ʿAbbās

As-Salam-o-'Alaikum. They caught hold of him and killed him and took possession of his flock. Then this verse was revealed:" He who meets you and extends you salutations, don't say: You are not a Muslim" (iv. 94). Ibn 'Abbas, however, recited the word as-Salam instead of" as-Salam".  

مسلم:٣٠٢٥ – حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ وَأَحْمَدُ بْنُ عَبْدَةَ الضَّبِّيُّ وَاللَّفْظُ لاِبْنِ أَبِي شَيْبَةَ قَالَ حَدَّثَنَا وَقَالَ الآخَرَانِ أَخْبَرَنَا سُفْيَانُ عَنْ عَمْرٍو عَنْ عَطَاءٍ عَنِ ابْنِ عَبَّاسٍ قَالَ

لَقِيَ نَاسٌ مِنَ الْمُسْلِمِينَ رَجُلاً فِي غُنَيْمَةٍ لَهُ فَقَالَ السَّلاَمُ عَلَيْكُمْ فَأَخَذُوهُ فَقَتَلُوهُ وَأَخَذُوا تِلْكَ الْغُنَيْمَةَ فَنَزَلَتْ { وَلاَ تَقُولُوا لِمَنْ أَلْقَى إِلَيْكُمُ السَّلَمَ لَسْتَ مُؤْمِنًا} وَقَرَأَهَا ابْنُ عَبَّاسٍ السَّلاَمَ  

See similar narrations below:

Collected by Bukhārī, Abū Dāwūd, Nasāʾī's Kubrá
bukhari:4591 – ʿAlī b. ʿAbdullāh > Sufyān > ʿAmr > ʿAṭāʾ > Ibn ʿAbbās And Lā > Ūā Liman Alqá Ilaykum al-Salām Last Muʾmin

Regarding the Verse: "And say not to anyone who offers you peace (by accepting Islam), You are not a believer." There was a man amidst his sheep. The Muslims pursued him, and he said (to them) "Peace be on you." But they killed him and took over his sheep. Thereupon Allah revealed in that concern, the above Verse up to:-- "...seeking the perishable good of this life." (4.94) i.e. those sheep.  

البخاري:٤٥٩١ – حَدَّثَنِي عَلِيُّ بْنُ عَبْدِ اللَّهِ حَدَّثَنَا سُفْيَانُ عَنْ عَمْرٍو عَنْ عَطَاءٍ عَنِ ابْنِ عَبَّاسٍ ؓ {وَلاَ تَقُولُوا لِمَنْ أَلْقَى إِلَيْكُمُ السَّلاَمَ لَسْتَ مُؤْمِنًا} قَالَ قَالَ ابْنُ عَبَّاسٍ كَانَ رَجُلٌ فِي غُنَيْمَةٍ لَهُ فَلَحِقَهُ الْمُسْلِمُونَ فَقَالَ

السَّلاَمُ عَلَيْكُمْ فَقَتَلُوهُ وَأَخَذُوا غُنَيْمَتَهُ فَأَنْزَلَ اللَّهُ فِي ذَلِكَ إِلَى قَوْلِهِ {عَرَضَ الْحَيَاةِ الدُّنْيَا} تِلْكَ الْغُنَيْمَةُ قَالَ قَرَأَ ابْنُ عَبَّاسٍ السَّلاَمَ  

abudawud:3974 – Muḥammad b. ʿĪsá > Sufyān > ʿAmr b. Dīnār > ʿAṭāʾ > Ibn ʿAbbās

The Muslims met a man with some sheep of his. He said: Peace be upon you. But they killed him and took those few sheep. Thereupon the following Qur'anic verse was revealed: "...And say to anyone who offers you a salutation: Thou art none of believer, coveting the perishable good of this life." meaning these few sheep.  

أبو داود:٣٩٧٤ – حَدَّثَنَا مُحَمَّدُ بْنُ عِيسَى حَدَّثَنَا سُفْيَانُ حَدَّثَنَا عَمْرُو بْنُ دِينَارٍ عَنْ عَطَاءٍ عَنِ ابْنِ عَبَّاسٍ قَالَ

لَحِقَ الْمُسْلِمُونَ رَجُلاً فِي غُنَيْمَةٍ لَهُ فَقَالَ السَّلاَمُ عَلَيْكُمْ فَقَتَلُوهُ وَأَخَذُوا تِلْكَ الْغُنَيْمَةَ فَنَزَلَتْ { وَلاَ تَقُولُوا لِمَنْ أَلْقَى إِلَيْكُمُ السَّلاَمَ لَسْتَ مُؤْمِنًا تَبْتَغُونَ عَرَضَ الْحَيَاةِ الدُّنْيَا } تِلْكَ الْغُنَيْمَةَ  

قَوْلُهُ تَعَالَى: {وَلَا تَقُولُوا لِمَنْ أَلْقَى إِلَيْكُمُ السَّلَامَ لَسْتَ مُؤْمِنًا تَبْتَغُونَ عَرَضَ الْحَيَاةِ الدُّنْيَا} [النساء: 94]

nasai-kubra:11051 – Muḥammad b. ʿAbdullāh b. Yazīd > Sufyān > ʿAmr > ʿAṭāʾ > Ibn ʿAbbās

The Muslims met a man with some sheep of his. He said: Peace be upon you. But they killed him and took those few sheep. Thereupon the following Qur'anic verse was revealed: "...And say to anyone who offers you a salutation: Thou art none of believer, coveting the perishable good of this life." meaning these few sheep. (Using translation from Abū Dāʾūd 3974)   

الكبرى للنسائي:١١٠٥١ – أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ اللهِ بْنِ يَزِيدَ حَدَّثَنَا سُفْيَانُ عَنْ عَمْرٍو سَمِعَ عَطَاءً عَنِ ابْنِ عَبَّاسٍ قَالَ §لَحِقَ الْمُسْلِمُونَ رَجُلًا فِي غُنَيْمَةٍ لَهُ فَقَالَ

السَّلَامُ عَلَيْكُمْ فَقَتَلُوهُ وَأَخَذُوا غُنَيْمَتَهُ فَأَنْزَلَ اللهُ ﷻ {وَلَا تَقُولُوا لِمَنْ أَلْقَى إِلَيْكُمُ السَّلَامَ لَسْتَ مُؤْمِنًا تَبْتَغُونَ عَرَضَ الْحَيَاةِ الدُّنْيَا} [النساء 94] تِلْكَ الْغُنَيْمَةُ  

nasai-kubra:8536 – Muḥammad b. ʿAbdullāh b. Yazīd > Sufyān > ʿAmr > ʿAṭāʾ > Ibn ʿAbbās

The Muslims met a man with some sheep of his. He said: Peace be upon you. But they killed him and took those few sheep. Thereupon the following Qur'anic verse was revealed: "...And say to anyone who offers you a salutation: Thou art none of believer, coveting the perishable good of this life." meaning these few sheep. (Using translation from Abū Dāʾūd 3974)   

الكبرى للنسائي:٨٥٣٦ – أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ اللهِ بْنِ يَزِيدَ قَالَ حَدَّثَنَا سُفْيَانُ عَنْ عَمْرٍو سَمِعَ عَطَاءً عَنِ ابْنِ عَبَّاسٍ قَالَ §لَحِقَ الْمُسْلِمُونَ رَجُلًا فِي غَنِيمَةٍ لَهُ فَقَالَ

السَّلَامُ عَلَيْكُمْ فَقَتَلُوهُ وَأَخَذُوا غَنِيمَتَهُ فَأَنْزَلَ اللهُ تَعَالَى {وَلَا تَقُولُوا لِمَنْ أَلْقَى إِلَيْكُمُ السَّلَامَ لَسْتَ مُؤْمِنًا تَبْتَغُونَ عَرَضَ الْحَيَاةِ الدُّنْيَا} [النساء 94] تِلْكَ الْغَنِيمَةُ