Prayer (Kitab Al-Salat): Detailed Rules of Law about the Prayer during Journey

Dawud :: Book 4 : Hadith 1243

Narrated AbuBakrah:

The Prophet (peace_be_upon_him) offered the noon prayer in time of danger. Some of the people formed a row behind him and others arrayed themselves against the enemy. He led them in two rak'ahs and then he uttered the salutation. Then those who were with him went away and took the position of their companions before the enemy. Then they came and prayed behind him. He led them in two rak'ahs and uttered the salutation. Thus the Apostle of Allah (peace_be_upon_him) offered four rak'ahs and his companions offered two rak'ahs.

Al-Hasan used to give legal verdict on the authority of this tradition.