Sunan an-Nasa'i 1551
سنن النسائي#1551Sahihأَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، وَإِسْمَاعِيلُ بْنُ مَسْعُودٍ، - وَاللَّفْظُ لَهُ - قَالاَ حَدَّثَنَا خَالِدٌ، عَنْ أَشْعَثَ، عَنِ الْحَسَنِ، عَنْ أَبِي بَكْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم صَلَّى بِالْقَوْمِ فِي الْخَوْفِ رَكْعَتَيْنِ ثُمَّ سَلَّمَ ثُمَّ صَلَّى بِالْقَوْمِ الآخَرِينَ رَكْعَتَيْنِ ثُمَّ سَلَّمَ فَصَلَّى النَّبِيُّ صلى الله عليه وسلم أَرْبَعًا .
It was narrated from Abu Bakrah that: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
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 18:23