The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 933
'Adi reported: I heard al-Bara' narrating it from the Apostle of Allah (may peace be upon him) that while in a journey he said the night prayer and recited in one of the two rak'ahs:" By the Fig and the Olive" (Su'rah xcv.).