It was narrated from Umm Salamah that the Prophet ﷺ used to pray two short Rak’ah after Witr, sitting down.  

أَنَّ النَّبِيَّ ﷺ كَانَ يُصَلِّي بَعْدَ الْوِتْرِ رَكْعَتَيْنِ خَفِيفَتَيْنِ وَهُوَ جَالِسٌ  

“Aishah narrated to me that the Messenger of Allah ﷺ prayed Witr with one Rak’ah, then he prayed two Rak’ah in which he recited while sitting, then when he wanted to bow, he stood up and bowed.”  

كَانَ رَسُولُ اللَّهِ ﷺ يُوتِرُ بِوَاحِدَةٍ ثُمَّ يَرْكَعُ رَكْعَتَيْنِ يَقْرَأُ فِيهِمَا وَهُوَ جَالِسٌ فَإِذَا أَرَادَ أَنْ يَرْكَعَ قَامَ فَرَكَعَ