Musnad Ahmad #622
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 إِبْرَاهِيمُ بْنُ أَبِي الْعَبَّاسِ، حَدَّثَنَا شَرِيكٌ، عَنْ أَبِي إِسْحَاقَ، عَنِ الْحَارِثِ، عَنْ عَلِيٍّ، رَضِيَ اللَّهُ عَنْهُ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ كَانَ يُوتِرُ عِنْدَ الْأَذَانِ وَيُصَلِّي الرَّكْعَتَيْنِ عِنْدَ الْإِقَامَةِ.
It was narrated from ‘Ali (رضي الله عنه) that the Prophet (ﷺ) used to pray Witr when the adhan was given and he prayed two rak`ahs when the iqamah was given.
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About Musnad Ahmad
This hadith is #622 from Musnad Ahmad, in the Book of Musnad 'Ali Ibn Abi Talib.