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:1782 – Aḥmad b. Naṣr > ʿAmr b. Muḥammad > ʿAthhām b. ʿAlī > al-Aʿmash > Ḥabīb b. Abū Thābit > Saʿīd b. Jubayr > Ibn ʿAbbās

"The Prophet ﷺ used to pray two rak'ahs of Fajr when he heard the Adhan and he made them brief."  

النسائي:١٧٨٢ – أَخْبَرَنَا أَحْمَدُ بْنُ نَصْرٍ قَالَ حَدَّثَنَا عَمْرُو بْنُ مُحَمَّدٍ قَالَ حَدَّثَنَا عَثَّامُ بْنُ عَلِيٍّ قَالَ حَدَّثَنَا الأَعْمَشُ عَنْ حَبِيبِ بْنِ أَبِي ثَابِتٍ عَنْ سَعِيدِ بْنِ جُبَيْرٍ عَنِ ابْنِ عَبَّاسٍ قَالَ

كَانَ النَّبِيُّ ﷺ يُصَلِّي رَكْعَتَىِ الْفَجْرِ إِذَا سَمِعَ الأَذَانَ وَيُخَفِّفُهُمَا قَالَ أَبُو عَبْدِ الرَّحْمَنِ هَذَا حَدِيثٌ مُنْكَرٌ  

See similar narrations below:

Collected by Muslim, Nasāʾī's Kubrá
muslim:724a – ʿAmr al-Nāqid > ʿAbdah b. Sulaymān > Hishām b. ʿUrwah from his father > ʿĀʾishah

The Messenger of Allah ﷺ used to observe two rak'ahs of Sunnah (prayer) when he heard the Adhin and shortened them.  

مسلم:٧٢٤a – حَدَّثَنَا عَمْرٌو النَّاقِدُ حَدَّثَنَا عَبْدَةُ بْنُ سُلَيْمَانَ حَدَّثَنَا هِشَامُ بْنُ عُرْوَةَ عَنْ أَبِيهِ عَنْ عَائِشَةَ قَالَتْ

كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي رَكْعَتَىِ الْفَجْرِ إِذَا سَمِعَ الأَذَانَ وَيُخَفِّفُهُمَا  

nasai-kubra:9402 – Muḥammad b. Yaḥyá b. Muḥammad b. Kathīr al-Ḥarrānī > Saʿīd b. Ḥafṣ > Mūsá b. Aʿyan > ʿĪsá b. Yūnus > al-Ḍaḥḥāk b. ʿAbd al-Raḥman > ʿAṭāʾ al-Khurāsānī > Saʿīd b. al-Musayyib > Qāl ʿUmar Liṣuhayb Mā Lī Ará ʿAlayk Khātam al-Dhahab > Qad Rāh Man > Khayr Mink Falam Yaʿibh > Man

[Machine] The Messenger of Allah ﷺ said, "Abu Abdur-Rahman said, 'This is a rejected (disliked) narration.'"  

الكبرى للنسائي:٩٤٠٢ – أَخْبَرَنَا مُحَمَّدُ بْنُ يَحْيَى بْنِ مُحَمَّدِ بْنِ كَثِيرٍ الْحَرَّانِيُّ قَالَ حَدَّثَنَا سَعِيدُ بْنُ حَفْصٍ قَالَ أَخْبَرَنَا مُوسَى بْنُ أَعْيَنَ عَنْ عِيسَى بْنِ يُونُسَ عَنِ الضَّحَّاكِ بْنِ عَبْدِ الرَّحْمَنِ عَنْ عَطَاءٍ الْخُرَاسَانِيِّ عَنْ سَعِيدِ بْنِ الْمُسَيِّبِ قَالَ قَالَ عُمَرُ لِصُهَيْبٍ مَا لِي أَرَى عَلَيْكَ خَاتَمَ الذَّهَبِ؟ قَالَ قَدْ رَآهُ مَنْ هُوَ خَيْرٌ مِنْكَ فَلَمْ يَعِبْهُ قَالَ مَنْ هُوَ؟

قَالَ رَسُولُ اللهِ ﷺ قَالَ أَبُو عَبْدِ الرَّحْمَنِ هَذَا حَدِيثٌ مُنْكَرٌ