´Musa bin Salamah narrated that he asked Ibn 'Abbas:` "I missed the prayer in congregation when I was in Al-Batha; how do you think I should pray?" He said: "Two rak'ahs, the sunnah of the Messenger of Allah (ﷺ)."
Hadith ReferenceSunan an-Nasa'i / The Book of Shortening the Prayer When Traveling / Hadith: 1445