Sunan Abi Dawud 1416

سنن أبي داود#1416Sahih

حَدَّثَنَا إِبْرَاهِيمُ بْنُ مُوسَى، أَخْبَرَنَا عِيسَى، عَنْ زَكَرِيَّا، عَنْ أَبِي إِسْحَاقَ، عَنْ عَاصِمٍ، عَنْ عَلِيٍّ، - رضى الله عنه - قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ يَا أَهْلَ الْقُرْآنِ أَوْتِرُوا فَإِنَّ اللَّهَ وِتْرٌ يُحِبُّ الْوِتْرَ ‏"‏ ‏.‏

Narrated Ali ibn AbuTalib: The Prophet (ﷺ) said: Allah is single (witr) and loves what is single, so observe the witr, you who follow the Qur'an

Scholarly Authentication

The label above is the grade most of these scholars gave, each scholar counted once — 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. When they judged only its chain of narrators (“Isnaad”), the label says “Sound chain”. Each scholar's own wording:

Al-AlbaniSahih
Shuaib Al ArnautSahih Lighairihi
Zubair Ali ZaiDaif

Our source also lists this ruling under Muhammad Muhyi Al-Din Abdul Hamid, the editor of the printed edition it was taken from. It is al-Albani's ruling printed again, so it is counted once.

In-book reference: 8:1