´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 Referenceسنن نسائي / كتاب تقصير الصلاة فى السفر / 1445