Sunan Abi Dawud 772
سنن أبي داود#772Sahihحَدَّثَنَا أَبُو كَامِلٍ، حَدَّثَنَا خَالِدٌ، - يَعْنِي ابْنَ الْحَارِثِ - حَدَّثَنَا عِمْرَانُ بْنُ مُسْلِمٍ، أَنَّ قَيْسَ بْنَ سَعْدٍ، حَدَّثَهُ قَالَ حَدَّثَنَا طَاوُسٌ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ فِي التَّهَجُّدِ يَقُولُ بَعْدَ مَا يَقُولُ " اللَّهُ أَكْبَرُ " . ثُمَّ ذَكَرَ مَعْنَاهُ .
Ibn ‘Abbas said:The Messenger of Allah (ﷺ) used to say in his tahajjud prayer(i.e. supererogatory prayer offered in or after the midnight) after he said the takbir; he then narrated the tradition to the same effect
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: 2:382