Musnad Ahmad #646
Musnad 'Ali Ibn Abi Talib
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنِي أَسْوَدُ بْنُ عَامِرٍ، أَخْبَرَنَا أَبُو بَكْرٍ، عَنْ أَبِي إِسْحَاقَ، عَنِ الْحَارِثِ، عَنْ عَلِيٍّ، رَضِيَ اللَّهُ عَنْهُ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ يُوتِرُ بِثَلَاثٍ.
It was narrated from ‘Ali (رضي الله عنه) that The Prophet (ﷺ) used to pray Witr with three raka’hs
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About Musnad Ahmad
This hadith is #646 from Musnad Ahmad, in the Book of Musnad 'Ali Ibn Abi Talib.