حَدَّثَنَا أَسْوَدُ حَدَّثَنَا شَرِيكٌ عَنْ أَبِي إِسْحَاقَ عَنِ الْحَارِثِ عَنْ عَلِيٍّ رَضِيَ اللَّهُ عَنْهُ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ يُوتِرُ عِنْدَ الْأَذَانِ وَيُصَلِّي الرَّكْعَتَيْنِ عِنْدَ الْإِقَامَةِ
مسند امام احمد بن حنبل · Hadith 884
It was narrated that 'Ali (RA) said: The Prophet (PBUH) used to pray Witr at the time of the adhan and pray two rak'ahs at the time of the iqamah.
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020