حَدَّثَنَا عَبْدُ الرَّزَّاقِ حَدَّثَنَا سُفْيَانُ عَنْ خُصَيْفٍ عَنْ أَبِي عُبَيْدَةَ عَنْ عَبْدِ اللَّهِ قَالَ كُنَّا مَعَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَصَفَّ صَفَّا خَلْفَهُ وَصَفٌّ مُوَازِي الْعَدُوِّ قَالَ وَهُمْ فِي صَلَاةٍ كُلُّهُمْ قَالَ وَكَبَّرَ وَكَبَّرُوا جَمِيعًا فَصَلَّى بِالصَّفِّ الَّذِي يَلِيهِ رَكْعَةً وَصَفٌّ مُوَازِي الْعَدُوِّ قَالَ ثُمَّ ذَهَبَ هَؤُلَاءِ وَجَاءَ هَؤُلَاءِ فَصَلَّى بِهِمْ رَكْعَةً ثُمَّ قَامَ هَؤُلَاءِ الَّذِينَ صَلَّى بِهِمْ الرَّكْعَةَ الثَّانِيَةَ فَقَضَوْا مَكَانَهُمْ ثُمَّ ذَهَبَ هَؤُلَاءِ إِلَى مَصَافِّ هَؤُلَاءِ وَجَاءَ أُولَئِكَ فَقَضَوْا رَكْعَةً
مسند امام احمد بن حنبل · Hadith 3882
It was narrated that 'Abdullah (RA) said: We were with the Messenger of Allah (PBUH), and he made one row stand behind him, and there was another row facing the enemy. They all joined the prayer; he said takbeer and they all said takbeer together. Then he led the row that was behind him in praying one rak'ah, whilst the other row was facing the enemy. Then they went, and the others came, and he led them in praying one rak'ah. Then those whom he had led in praying the second rak'ah stood up and made up (the rak'ah they had not prayed with the Prophet (PBUH)), then they went back and switched places with the others, and the others came and made up the rak'ah they had missed.
Sanad
حَدَّثَنَا عَبْدُ الرَّزَّاقِ حَدَّثَنَا سُفْيَانُ عَنْ خُصَيْفٍ عَنْ أَبِي عُبَيْدَةَ عَنْ عَبْدِ اللَّهِ