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.
tabarani:9414Muḥammad b. al-Naḍr al-Azdī > Muʿāwiyah b. ʿAmr > Zāʾidah > Hishām b. ʿUrwah > Ibn Masʿūd > Mā Bālayt > Ṣalāh al-Fajr Uqīmat

[Machine] That the Fajr prayer was established while I was performing the Witr prayer.  

الطبراني:٩٤١٤حَدَّثَنَا مُحَمَّدُ بْنُ النَّضْرِ الْأَزْدِيُّ ثنا مُعَاوِيَةُ بْنُ عَمْرٍو ثنا زَائِدَةُ عَنْ هِشَامِ بْنِ عُرْوَةَ عَنِ ابْنِ مَسْعُودٍ قَالَ «§مَا بَالَيْتُ

أَنَّ صَلَاةَ الْفَجْرِ أُقِيمَتْ وَأَنَا أُوتِرُ»