[Machine] The Prophet ﷺ said, "The Witr prayer is one unit (rak'ah) performed at the end of the night." Yahya ibn Sa'id and Muhammad ibn Ja'far disagreed with him.  

أَنَّ النَّبِيَّ ﷺ قَالَ «الْوِتْرُ رَكْعَةٌ مِنْ آخِرِ اللَّيْلِ» خَالَفَهُ يَحْيَى بْنُ سَعِيدٍ وَمُحَمَّدُ بْنُ جَعْفَرٍ  

Witr is a rak'ah at the end of the night prayer. (Using translation from Muslim 752b)   

عَنِ النَّبِيِّ ﷺ قَالَ «الْوِتْرُ رَكْعَةٌ مِنْ آخِرِ اللَّيْلِ» خَالَفَهُ هَمَّامُ بْنُ يَحْيَى  

A man who lived in the desert asked the Messenger of Allah ﷺ about the prayer at night. He made a sign with his two fingers-in this way in pairs. The witr consists of one rak'ah towards the end in night. (Using translation from Abū Dāʾūd 1421)   

أَنَّ رَجُلًا سَأَلَ رَسُولَ اللهِ ﷺ عَنْ صَلَاةِ اللَّيْلِ فَقَالَ «مَثْنَى مَثْنَى وَالْوَتْرُ رَكْعَةٌ مِنْ آخِرِ اللَّيْلِ»