Sunan Abi Dawud 1365
سنن أبي داود#1365Sahihحَدَّثَنَا نُوحُ بْنُ حَبِيبٍ، وَيَحْيَى بْنُ مُوسَى، قَالاَ حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ ابْنِ طَاوُسٍ، عَنْ عِكْرِمَةَ بْنِ خَالِدٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ : بِتُّ عِنْدَ خَالَتِي مَيْمُونَةَ فَقَامَ النَّبِيُّ صلى الله عليه وسلم يُصَلِّي مِنَ اللَّيْلِ فَصَلَّى ثَلاَثَ عَشْرَةَ رَكْعَةً مِنْهَا رَكْعَتَا الْفَجْرِ، حَزَرْتُ قِيَامَهُ فِي كُلِّ رَكْعَةٍ بِقَدْرِ { يَا أَيُّهَا الْمُزَّمِّلُ } لَمْ يَقُلْ نُوحٌ : مِنْهَا رَكْعَتَا الْفَجْرِ .
Narrated Abdullah ibn Abbas: I spent a night with my maternal aunt Maymunah. The Prophet (ﷺ) got up to pray at night. He prayed thirteen rak'ahs including two rak'ahs of the dawn prayer. I guessed that he stood in every rak'ah as long as one could recite Surah al-Muzzammil
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 5:116