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nasai-kubra:521 – Ismāʿīl b. Masʿūd > Khālid / Ibn al-Ḥārith > Ashʿath > al-Ḥasan > Abū Bakrah

The Messenger of Allah ﷺ led the people in offering the fear prayer, two rak'ahs. Then he said the taslim and led others in offering the fear prayer, then he said the taslim. So the Prophet ﷺ had prayed four rak'ahs. (Using translation from Nasāʾī 1551)   

الكبرى للنسائي:٥٢١ – أَخْبَرَنَا إِسْمَاعِيلُ بْنُ مَسْعُودٍ قَالَ حَدَّثَنَا خَالِدٌ وَهُوَ ابْنُ الْحَارِثِ عَنْ أَشْعَثَ عَنِ الْحَسَنِ عَنْ أَبِي بَكْرَةَ

أَنَّ رَسُولَ اللهِ ﷺ «صَلَّى بِالْقَوْمِ فِي الْخَوْفِ رَكْعَتَيْنِ ثُمَّ سَلَّمَ ثُمَّ صَلَّى بِالْقَوْمِ الْآخَرِينَ رَكْعَتَيْنِ ثُمَّ سَلَّمَ فَصَلَّى النَّبِيُّ ﷺ أَرْبَعًا» خَالَفَهُ يُونُسُ بْنُ عُبَيْدٍ  

See similar narrations below:

Collected by Nasāʾī, Nasāʾī's Kubrá
nasai:1551 – Muḥammad b. ʿAbd al-Aʿlá And ʾIsmāʿīl b. Masʿūd > Khālid > Ashʿath > al-Ḥasan > Abū Bakrah

The Messenger of Allah ﷺ led the people in offering the fear prayer, two rak'ahs. Then he said the taslim and led others in offering the fear prayer, then he said the taslim. So the Prophet ﷺ had prayed four rak'ahs.  

النسائي:١٥٥١ – أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى وَإِسْمَاعِيلُ بْنُ مَسْعُودٍ وَاللَّفْظُ لَهُ قَالاَ حَدَّثَنَا خَالِدٌ عَنْ أَشْعَثَ عَنِ الْحَسَنِ عَنْ أَبِي بَكْرَةَ

أَنَّ رَسُولَ اللَّهِ ﷺ صَلَّى بِالْقَوْمِ فِي الْخَوْفِ رَكْعَتَيْنِ ثُمَّ سَلَّمَ ثُمَّ صَلَّى بِالْقَوْمِ الآخَرِينَ رَكْعَتَيْنِ ثُمَّ سَلَّمَ فَصَلَّى النَّبِيُّ ﷺ أَرْبَعًا  

nasai-kubra:1952 – Muḥammad b. ʿAbd al-Aʿlá And ʾIsmāʿīl b. Masʿūd > Khālid > Shʿath > al-Ḥasan > Abū Bakarah

The Messenger of Allah ﷺ led the people in offering the fear prayer, two rak'ahs. Then he said the taslim and led others in offering the fear prayer, then he said the taslim. So the Prophet ﷺ had prayed four rak'ahs. (Using translation from Nasāʾī 1551)  

الكبرى للنسائي:١٩٥٢ – أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الْأَعْلَى وَإِسْمَاعِيلُ بْنُ مَسْعُودٍ وَاللَّفْظُ لَهُ قَالَا حَدَّثَنَا خَالِدٌ عَنْ أشْعَثَ عَنِ الْحَسَنِ عَنْ أَبِي بَكَرَةَ

أَنَّ رَسُولَ اللهِ ﷺ «صَلَّى بِالْقَوْمِ رَكْعَتَيْنِ ثُمَّ سَلَّمَ ثُمَّ صَلَّى بِالْقَوْمِ فِي الْخَوْفِ رَكْعَتَيْنِ ثُمَّ سَلَّمَ فَصَلَّى النَّبِيُّ ﷺ أَرْبَعًا»