Musnad Ahmad #746
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.
حَدَّثَنَا هَاشِمٌ، حَدَّثَنَا أَبُو خَيْثَمَةَ، حَدَّثَنَا أَبُو إِسْحَاقَ، عَنْ عَاصِمِ بْنِ ضَمْرَةَ، عَنْ عَلِيٍّ، رَضِيَ اللَّهُ عَنْهُ قَالَ إِنَّ الْوَتْرَ لَيْسَ بِحَتْمٍ وَلَكِنَّهُ سُنَّةٌ مِنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَإِنَّ اللَّهَ عَزَّ وَجَلَّ وِتْرٌ يُحِبُّ الْوَتْرَ.
It was narrated that ‘Ali (رضي الله عنه) said. Witr is not a must, but it is a Sunnah from the Messenger of Allah (ﷺ) and Allah, may He be glorified and exalted, is One and loves that which is odd numbered.
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About Musnad Ahmad
This hadith is #746 from Musnad Ahmad, in the Book of Musnad 'Ali Ibn Abi Talib.