Sunan Ibn Majah — Establishing the Prayer and the Sunnah Regarding Them — Hadith No: 1063
Translation
It was narrated that ‘Umar said:“The prayer while traveling is two Rak’ah, and Friday is two Rak’ah, and ‘Eid is two Rak’ah. They are complete and are not shortened, as told by Muhammad (ﷺ).”