"The Prophet prayed Salat Al-Khawf, praying one Rak'ah with one of the two groups, while the other group was facing the enemy. (When the first group finished they first Rak'ah with him), they went and took position (of the second group, facing the enemy). Then the second group came and he led them in another Rak'ah, then he said the Taslim to them, while the group proceeded to complete their (second) Rak'ah. Thereafter, the first group stood up to finish their (second) Rak'ah."  

أَنَّ النَّبِيَّ ﷺ صَلَّى صَلاَةَ الْخَوْفِ بِإِحْدَى الطَّائِفَتَيْنِ رَكْعَةً وَالطَّائِفَةُ الأُخْرَى مُوَاجِهَةُ الْعَدُوِّ ثُمَّ انْصَرَفُوا فَقَامُوا فِي مَقَامِ أُولَئِكَ وَجَاءَ أُولَئِكَ فَصَلَّى بِهِمْ رَكْعَةً أُخْرَى ثُمَّ سَلَّمَ عَلَيْهِمْ فَقَامَ هَؤُلاَءِ فَقَضَوْا رَكْعَتَهُمْ وَقَامَ هَؤُلاَءِ فَقَضَوْا رَكْعَتَهُمْ  

"The Imam stands facing the Qiblah while a group of them stand with him, and a group is before the enemy, facing the enemy. He leads them in a Rak'ah, and they perform a bowing by themselves, and they perform two prostrations in their places. Then they go to take the position of the others and the others come (for prayers). He (the Imam) bows for one Rak'ah with them and performs two prostrations with them. That is two for him and one for them, then they perform one bowing and two prostrations."  

يَقُومُ الإِمَامُ مُسْتَقْبِلَ الْقِبْلَةِ وَتَقُومُ طَائِفَةٌ مِنْهُمْ مَعَهُ وَطَائِفَةٌ مِنْ قِبَلِ الْعَدُوِّ وَوُجُوهُمْ إِلَى الْعَدُوِّ فَيَرْكَعُ بِهِمْ رَكْعَةً وَيَرْكَعُونَ لأَنْفُسِهِمْ رَكْعَةً وَيَسْجُدُونَ لأَنْفُسِهِمْ سَجْدَتَيْنِ فِي مَكَانِهِمْ ثُمَّ يَذْهَبُونَ إِلَى مَقَامِ أُولَئِكَ وَيَجِيءُ أُولَئِكَ فَيَرْكَعُ بِهِمْ رَكْعَةً وَيَسْجُدُ بِهِمْ سَجْدَتَيْنِ فَهِيَ لَهُ ثِنْتَانِ وَلَهُمْ وَاحِدَةٌ ثُمَّ يَرْكَعُونَ رَكْعَةً وَيَسْجُدُونَ سَجْدَتَيْنِ  

) Muhammad bin Bash-har said: "I asked Yahya bin Sa'eed (narrators in no. 565) about this Hadith. So he narrated it to me from Shu'bah, from Abdur-Rahman bin Al-Qasim, from his father, from Salih bin Khawwat, from Sahl bin Abi Hathmah, from the Prophet - the same as the Hadith of Yahya bin Sa'eed Al-Ansari. And he (Yahya) said to me: "Write it next to it. He did not memorize the Hadith better though, rather it is the same Hadith as that of Yahya bin Sa'eed Al-Ansari'" (a Hadith similar to no. 565, with a different chain of narrators)  

عَنِ النَّبِيِّ ﷺ بِمِثْلِ حَدِيثِ يَحْيَى بْنِ سَعِيدٍ الأَنْصَارِيِّ وَقَالَ لِي يَحْيَى اكْتُبْهُ إِلَى جَنْبِهِ وَلَسْتُ أَحْفَظُ الْحَدِيثَ وَلَكِنَّهُ مِثْلُ حَدِيثِ يَحْيَى بْنِ سَعِيدٍ الأَنْصَارِيِّ  

from Salih bin Khawwat, from someone who prayed Salat Al-Khawf with the Prophet, and he mentioned a similar narration.  

عَنْ صَالِحِ بْنِ خَوَّاتٍ عَمَّنْ صَلَّى مَعَ النَّبِيِّ ﷺ صَلاَةَ الْخَوْفِ فَذَكَرَ نَحْوَهُ