[Machine] The Prophet ﷺ used to perform them (two units) after Witr prayer while sitting down, reciting in them when the earth would shake, and say: "O disbelievers!"  

أَنَّ النَّبِيَّ ﷺ كَانَ يُصَلِّيهِمَا بَعْدَ الْوِتْرِ وَهُوَجَالِسٌ يَقْرَأُ فِيهِمَا إِذَا زُلْزِلَتِ الْأَرْضُ وَقُلْ يَا أَيُّهَا الْكَافِرُونَ  

[Machine] The Messenger of Allah ﷺ used to perform the Witr prayer with nine units, until his body became heavy, then he performed Witr with seven units. He also performed two Rak'ahs while seated, and recited "When the earth is shaken" and "Say, O disbelievers."  

كَانَ رَسُولُ اللهِ ﷺ يُوتِرُ بِتِسْعٍ حَتَّى إِذَا بَدَّنَ وَكَثُرَ لَحْمُهُ أَوْتَرَ بِسَبْعٍ وَصَلَّى رَكْعَتَيْنِ وَهُوَ جَالِسٌ فَقَرَأَ بِ إِذَا زُلْزِلَتْ وَقُلْ يَا أَيُّهَا الْكَافِرُونَ  

[Machine] The Prophet ﷺ used to pray two rak'ahs after Witr while sitting, and in them he would recite (the surah) 'When the earth is shaken' and (the surah) 'Say: O disbelievers'.  

أَنَّ النَّبِيَّ ﷺ كَانَ يُصَلِّي رَكْعَتَيْنِ بَعْدَ الْوِتْرِ وَهُوَ جَالِسٌ يَقْرَأُ فِيهِمَا إِذَا زُلْزِلَتْ وَقُلْ يَا أَيُّهَا الْكَافِرُونَ