The Messenger of Allah ﷺ led them in offering the fear prayer. Some formed a row behind him and some formed a row facing the enemy. He led them in praying one rak'ah, then they moved away and the others came, and he led them in praying one rak'ah, then they got up and each (group) made up the other rak'ah.  

أَنَّ رَسُولَ اللَّهِ ﷺ صَلَّى بِهِمْ صَلاَةَ الْخَوْفِ فَصَفَّ صَفًّا خَلْفَهُ وَصَفًّا مُصَافُّو الْعَدُوِّ فَصَلَّى بِهِمْ رَكْعَةً ثُمَّ ذَهَبَ هَؤُلاَءِ وَجَاءَ أُولَئِكَ فَصَلَّى بِهِمْ رَكْعَةً ثُمَّ قَامُوا فَقَضَوْا رَكْعَةً رَكْعَةً  

The Messenger of Allah ﷺ led them in offering the fear prayer. One row stood in front of him and another row stood behind him. He led those who were behind in prayer, bowing once and prostrating twice, then they moved forward until they took the place of their companions, and the others came and took their place, and the Messenger of Allah ﷺ led them in prayer, bowing once and prostrating twice, then he said the taslim, so the Prophet ﷺ had prayed two rak'ahs and they had prayed one. (Using translation from Nasāʾī 1545)  

أَنَّ رَسُولَ اللهِ ﷺ صَلَّى بِهِمْ صَلَاةَ الْخَوْفِ فَقَامَ صَفٌّ بَيْنَ يَدَيْهِ وَصَفٌّ خَلْفَهُ فَصَلَّى بِالَّذِي خَلْفَهُ رَكْعَةً وَسَجْدَتَيْنِ ثُمَّ تَقَدَّمَ هَؤُلَاءِ حَتَّى قَامُوا فِي مَقَامِ أَصْحَابِهِمْ وَجَاءَ أُولَئِكَ حَتَّى قَامُوا مَقَامَ هَؤُلَاءِ فَصَلَّى بِهِمْ رَسُولُ اللهِ ﷺ رَكْعَةً وَسَجْدَتَيْنِ ثُمَّ سَلَّمَ فَكَانَتْ لِلنَّبِيِّ ﷺرَكْعَتَانِ وَلَهُمْ رَكْعَةً  

[Machine] The Messenger of Allahﷺ performed the prayer of fear, with those behind him forming a row, and another row equivalent to the enemy. He prayed with them one unit of prayer, then these (those who were behind him) went to the position of these (those equivalent to the enemy), and these (those equivalent to the enemy) came (forward), and he prayed with them one unit of prayer, then he said the tasleem. So it was two units for the Prophetﷺ and one unit for each group.  

صَلَّى رَسُولُ اللهِ ﷺ صَلَاةَ الْخَوْفِ بِذِي قَرَدٍ صَفًّا خَلْفَهُ وَصَفًّا مُوَازِيَ الْعَدُوِّ وَصَلَّى بِهِمْ رَكْعَةً ثُمَّ ذَهَبَ هَؤُلَاءِ إِلَى مَصَافِّ هَؤُلَاءِ وَجَاءَ هَؤُلَاءِ فَصَلَّى بِهِمْ رَكْعَةً ثُمَّ سَلَّمَ فَكَانَتْ لِلنَّبِيِّ ﷺ رَكْعَتَيْنِ وَلِكُلِّ طَائِفَةٍ رَكْعَةً  

[Machine] On the authority of Sahl ibn Abi Hathmah, it was reported that Abdurrahman raised his hands to the Prophet ﷺ . And regarding Yahya, he mentioned from Sahl that he said, the Imam stands and there is a description behind him and a description in front of him. He prays the prayer with those behind him, a unit of prayer, two prostrations, then he stands until they pray another unit of prayer, then they move forward to the place of their companions. Then those (companions) come and stand in the place of those (who were behind the Imam) and he prays a unit of prayer with them, two prostrations, then he sits until they complete another unit of prayer, then he offers them the greeting (of peace).  

عَنْ سَهْلِ بْنِ أَبِي حَثْمَةَ أَمَّا عَبْدُ الرَّحْمَنِ فَرَفَعَهُ إِلَى النَّبِيِّ ﷺ وَأَمَّا يَحْيَى فَذَكَرَ عَنْ سَهْلٍ قَالَ يَقُومُ الْإِمَامُ وَصَفٌّ خَلْفَهُ وَصَفٌّ بَيْنَ يَدَيْهِ فَيُصَلِّي بِالَّذِي خَلْفَهُ رَكْعَةً وَسَجْدَتَيْنِ ثُمَّ يَقُومُ قَائِمًا حَتَّى يُصَلُّوا رَكْعَةً أُخْرَى ثُمَّ يَتَقَدَّمُونَ إِلَى مَكَانِ أَصْحَابِهِمْ ثُمَّ يَجِيءُ أُولَئِكَ فَيَقُومُونَ مَقَامَ هَؤُلَاءِ فَيُصَلِّي بِهِمْرَكْعَةً وَسَجْدَتَيْنِ ثُمَّ يَقْعُدُ حَتَّى يَقْضُوا رَكْعَةً أُخْرَى ثُمَّ يُسَلِّمُ عَلَيْهِمْ  

The Messenger of Allah ﷺ led them in offering the fear prayer. One row stood in front of him and another row stood behind him. He led those who were behind in prayer, bowing once and prostrating twice, then they moved forward until they took the place of their companions, and the others came and took their place, and the Messenger of Allah ﷺ led them in prayer, bowing once and prostrating twice, then he said the taslim, so the Prophet ﷺ had prayed two rak'ahs and they had prayed one. (Using translation from Nasāʾī 1545)   

أَنَّ رَسُولَ اللَّهِ ﷺ «صَلَّى بِهِمْ صَلَاةَ الْخَوْفِ فَقَامَ صَفٌّ بَيْنَ يَدَيْهِ وَصَفٌّ خَلْفَهُ فَصَلَّى بِهِمْ رَكْعَةً وَسَجْدَتَيْنِ وَجَاءَ أُولَئِكَ حَتَّى قَامُوا فَقَامَ هَؤُلَاءِ فَصَلَّى بِهِمْ رَسُولُ اللَّهِ ﷺ رَكْعَةً وَسَجْدَتَيْنِ» فَكَانَتْ لِلنَّبِيِّ ﷺ رَكْعَتَانِ وَلَهُمْ رَكْعَةٌ وَاحِدَةٌ  

[Machine] "The Messenger of Allah, ﷺ , performed the prayer of fear (Salat al-Khawf), so he arranged them in rows, facing the enemy, row after row. He prayed one rak'ah with them, then the row that followed him stayed behind, and they stood in the position of those who were facing the enemy. Those people advanced and prayed behind him one rak'ah, then he said the salutation to them. Then those who were behind him stood up and prayed one rak'ah, then those people advanced and stood in the position of those people, and they prayed one rak'ah."  

«صَلَّى رَسُولُ اللهِ ﷺ صَلَاةَ الْخَوْفِ فَصَفَّ خَلْفَهُ صَفًّا وَصَفًّا مُقَابِلَ الْعَدُوِّ فَصَلَّى بِهِمْ رَكْعَةً ثُمَّ تَأَخَّرَ الصَّفُّ الَّذِي يَلِيهِ فَقَامُوا مَقَامَ الَّذِينَ كَانُوا مُقَابِلَ الْعَدُوِّ وَتَقَدَّمَ أُولَئِكَ فَصَلُّوا خَلْفَهُ رَكْعَةً ثُمَّ سَلَّمَ عَلَيْهِمْ فَقَامَ الَّذِينَ خَلْفَهُ فَصَلُّوا رَكْعَةً ثُمَّ تَقَدَّمَ أُولَئِكَ فَقَامُوا مَقَامَ هَؤُلَاءِ فَصَلُّوا رَكْعَةً»  

The Messenger of Allah ﷺ led them in offering the fear prayer. Some formed a row behind him and some formed a row facing the enemy. He led them in praying one rak'ah, then they moved away and the others came, and he led them in praying one rak'ah, then they got up and each (group) made up the other rak'ah. (Using translation from Nasāʾī 1536)  

أَنَّ رَسُولَ اللهِ ﷺ «صَلَّى بِهِمْ صَلَاةَ الْخَوْفِ فَصَفَّ صَفًّا خَلْفَهُ وَصَفًّا مُصَافِّي الْعَدُوِّ فَصَلَّى بِهِمْ رَكْعَةً ثُمَّ ذَهَبَ هَؤُلَاءِ وَجَاءَ أُولَئِكَ فَصَلَّى بِهِمْ رَكْعَةً ثُمَّ قَامُوا فَقَضَوْا رَكْعَةً رَكْعَةً»  

The Messenger of Allah ﷺ led them in offering the fear prayer. One row stood in front of him and another row stood behind him. He led those who were behind in prayer, bowing once and prostrating twice, then they moved forward until they took the place of their companions, and the others came and took their place, and the Messenger of Allah ﷺ led them in prayer, bowing once and prostrating twice, then he said the taslim, so the Prophet ﷺ had prayed two rak'ahs and they had prayed one. (Using translation from Nasāʾī 1545)  

«أَنَّ رَسُولَ اللهِ ﷺ صَلَّى بِهِمْ صَلَاةَ الْخَوْفِ فَقَامَ صَفٌّ بَيْنَ يَدَيْهِ وَصَفٌّ خَلْفَهُ صَلَّى بِالَّذِينَ خَلْفَهُ رَكْعَةً وَسَجْدَتَيْنِ ثُمَّ تَقَدَّمَ هَؤُلَاءِ حَتَّى قَامُوا فِي مَقَامِ أَصْحَابِهِمْ وَجَاءَ أُولَئِكَ فَقَامُوا مَقَامَ هَؤُلَاءِ صَلَّى لَهُمْ رَسُولُ اللهِ ﷺ رَكْعَةً وَسَجْدَتَيْنِ ثُمَّ سَلَّمَ فَكَانَ لِلنَّبِيِّ ﷺ رَكْعَتَانِ وَلَهُمْ رَكْعَةٌ»