I took part in a Ghazwa towards Najd along with Allah's Messenger (ﷺ) and we clashed with the enemy, and
we lined up for them.
Sahih al-Bukhari Book 64, Hadith 176
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(describing the Fear prayer): The Imam stands up facing the Qibla and one batch of them (i.e. the army) (out of the two) prays along with him and the other batch faces the enemy. The Imam offers one rak`a with the first batch they themselves stand up alone and offer one bowing and two prostrations while they are still in their place, and then go away to relieve the second batch, and the second batch comes (and takes the place of the first batch in the prayer behind the Imam) and he offers the second rak`a with them. So he completes his two-rak`at and then the second batch bows and prostrates two prostrations (i.e. complete their second rak`a and thus all complete their prayer).
(This hadith has also been narrated through two other chain by Sahl b. Abi Hathma)
Sahih al-Bukhari Book 64, Hadith 175 Next Hadith → Allah's Messenger (ﷺ) led the Fear-prayer with one of the two batches of the army while the other (batch) faced the enemy. Then the first batch went away and took places of their companions (i.e. second batch) and the second batch came and he led his second rak`a with them. Then he (i.e. the Prophet: finished his prayer with Taslim and then each of the two batches got up and completed their remaining one rak`a.
Sahih al-Bukhari Book 64, Hadith 177
(This hadith has also been narrated through two other chain by Sahl b. Abi Hathma)
Sahih al-Bukhari Book 64, Hadith 175 Next Hadith → Allah's Messenger (ﷺ) led the Fear-prayer with one of the two batches of the army while the other (batch) faced the enemy. Then the first batch went away and took places of their companions (i.e. second batch) and the second batch came and he led his second rak`a with them. Then he (i.e. the Prophet: finished his prayer with Taslim and then each of the two batches got up and completed their remaining one rak`a.
Sahih al-Bukhari Book 64, Hadith 177