Musnad Ahmad 658:216

Muhammad ibn Ja‘far and Bahz narrated to us, they said: Shu‘bah narrated to us, from ‘Adi. Bahz said: ‘Adi ibn Thabit narrated to us, he said: I heard al-Bara’, and Bahz said: From al-Bara’ ibn ‘Azib, saying: "The Messenger of Allah (may Allah bless him and grant him peace) was on a journey, and he prayed the last ‘Isha’ prayer. In one of the two rak‘ahs, he recited: 'By the Fig and the Olive' (At-Tin)."