حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ حَدَّثَنَا شُعْبَةُ وَحَجَّاجٌ قَالَ حَدَّثَنِي شُعْبَةُ عَنْ قَتَادَةَ وَسَمِعْتُ أَبَا مِجْلَزٍ سَمِعْتُ ابْنَ عُمَرَ يُحَدِّثُ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنَّهُ قَالَ الْوَتْرُ رَكْعَةٌ مِنْ آخِرِ اللَّيْلِ
مسند امام احمد بن حنبل · Hadith 5126
It was narrated from Qataadah: I heard Abu Mijlaz (say): I heard rbn 'Umar narrate from the Prophet (PBUH) that he said: "Witr is one rak'ah at the end of the night.”
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020