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
tirmidhi:2935 – Naṣr b. ʿAlī al-Jahḍamī > al-Muʿtamir b. Sulaymān from his father > Sulaymān al-Aʿmash > ʿAṭiyyah > Abū Saʿīd

"On the Day of (the battle of) Badr, the Romans had a victory over the Persians. So the believers were pleased with that, then the following was revealed: Alif Lam Mim. The Romans have been defeated..." up to His saying: '...the believers will rejoice. (30:1-4)" He said: "So the believers were happy with the victory of the Romans over the Persians.  

الترمذي:٢٩٣٥ – حَدَّثَنَا نَصْرُ بْنُ عَلِيٍّ الْجَهْضَمِيُّ قَالَ حَدَّثَنَا الْمُعْتَمِرُ بْنُ سُلَيْمَانَ عَنْ أَبِيهِ عَنْ سُلَيْمَانَ الأَعْمَشِ عَنْ عَطِيَّةَ عَنْ أَبِي سَعِيدٍ قَالَ

لَمَّا كَانَ يَوْمُ بَدْرٍ ظَهَرَتِ الرُّومُ عَلَى فَارِسَ فَأَعْجَبَ ذَلِكَ الْمُؤْمِنِينَ فَنَزَلَتْ ( الم * غُلِبَتِ الرُّومُ ) إِلَى قَوْلِهِ (يَفْرَحُ الْمُؤْمِنُونَ ) قَالَ فَفْرَحَ الْمُؤْمِنُونَ بِظُهُورِ الرُّومِ عَلَى فَارِسَ  

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ مِنْ هَذَا الْوَجْهِ وَيُقْرَأُ غَلَبَتْ وَغُلِبَتْ يَقُولُ كَانَتْ غُلِبَتْ ثُمَّ غَلَبَتْ هَكَذَا قَرَأَ نَصْرُ بْنُ عَلِيٍّ غَلَبَتْ

See similar narrations below:

Collected by Tirmidhī
tirmidhi:3192 – Naṣr b. ʿAlī al-Jahḍamī > al-Muʿtamir b. Sulaymān from his father > Sulaymān al-Aʿmash > ʿAṭiyyah > Abū Saʿīd

Abu Sa'eed narrated: "On the Day of Badr, the Romans had a victory over the Persians. So the believers were pleased with that, then the following was revealed: 'Alif Lam Mim. The Romans have been defeated, up to His saying: 'the believers will rejoice - with the help of Allah... (30:1-5)'" He said: "So the believers were happy with the victory of the Romans over the Persians."  

الترمذي:٣١٩٢ – حَدَّثَنَا نَصْرُ بْنُ عَلِيٍّ الْجَهْضَمِيُّ حَدَّثَنَا الْمُعْتَمِرُ بْنُ سُلَيْمَانَ عَنْ أَبِيهِ عَنْ سُلَيْمَانَ الأَعْمَشِ عَنْ عَطِيَّةَ عَنْ أَبِي سَعِيدٍ قَالَ

لَمَّا كَانَ يَوْمُ بَدْرٍ ظَهَرَتِ الرُّومُ عَلَى فَارِسَ فَأَعْجَبَ ذَلِكَ الْمُؤْمِنِينَ فَنَزَلَتْ ( الم *غَلَبَتِ الرُّومُ ) إِلَى قَوْلِهِ (يفْرَحُ الْمُؤْمِنُونَ بِنَصْرِ اللَّهِ ) قَالَ فَفَرِحَ الْمُؤْمِنُونَ بِظُهُورِ الرُّومِ عَلَى فَارِسَ قَالَ هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ مِنْ هَذَا الْوَجْهِ كَذَا قَرَأَ نَصْرُ بْنُ عَلِيٍّ (غَلَبَتِ الرُّومُ )