Sunan an-Nasa'i, Volume 2, Book 18, Hadith 1542 (DarusSalam) ⓘ

It was narrated that 'Abdullah bin Umar said: "The Messenger of Allah offered the fear prayer. He stood and said the takbir, and a group of us prayed behind him while another group was facing the enemy. The Messenger of Allah bowed once and prostrated twice with them, then they moved away but did not say the taslim. They went to face the enemy and lined up in their places, and the other group came and formed a row behind the Messenger of Allah, and he led them in praying, bowing once and prostrating twice. Then the Messenger of Allah said the taslim and he had bowed twice and prostrated four times. Then the two groups stood up and each man prayed by himself, bowing once and prostrating twice." Abu Bakr IB As-Sunni said: "Az-Zuhri heard two hadiths from Ibn 'Umar, and he did not hear this from him."

أَخْبَرَنِي عِمْرَانُ بْنُ بَكَّارٍ، قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ الْمُبَارَكِ، قَالَ أَنْبَأَنَا الْهَيْثَمُ بْنُ حُمَيْدٍ، عَنِ الْعَلاَءِ، وَأَبِي، أَيُّوبَ عَنِ الزُّهْرِيِّ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، قَالَ صَلَّى رَسُولُ اللَّهِ صلى الله عليه وسلم صَلاَةَ الْخَوْفِ قَامَ فَكَبَّرَ فَصَلَّى خَلْفَهُ طَائِفَةٌ مِنَّا وَطَائِفَةٌ مُوَاجِهَةَ الْعَدُوِّ فَرَكَعَ بِهِمْ رَسُولُ اللَّهِ صلى الله عليه وسلم رَكْعَةً وَسَجَدَ سَجْدَتَيْنِ ثُمَّ انْصَرَفُوا وَلَمْ يُسَلِّمُوا وَأَقْبَلُوا عَلَى الْعَدُوِّ فَصَفُّوا مَكَانَهُمْ وَجَاءَتِ الطَّائِفَةُ الأُخْرَى فَصَفُّوا خَلْفَ رَسُولِ اللَّهِ صلى الله عليه وسلم فَصَلَّى بِهِمْ رَكْعَةً وَسَجْدَتَيْنِ ثُمَّ سَلَّمَ رَسُولُ اللَّهِ صلى الله عليه وسلم وَقَدْ أَتَمَّ رَكْعَتَيْنِ وَأَرْبَعَ سَجَدَاتٍ ثُمَّ قَامَتِ الطَّائِفَتَانِ فَصَلَّى كُلُّ إِنْسَانٍ مِنْهُمْ لِنَفْسِهِ رَكْعَةً وَسَجْدَتَيْنِ ‏.‏ قَالَ أَبُو بَكْرِ بْنُ السُّنِّيِّ الزُّهْرِيُّ سَمِعَ مِنِ ابْنِ عُمَرَ حَدِيثَيْنِ وَلَمْ يَسْمَعْ هَذَا مِنْهُ ‏.‏