Sunan An-Nasa'i

It was narrated from 'Abdur-Rahman bin Abi Laila that 'Umar said:""Jumu'ah prayer is two rak'ahs, and the prayer of Al-Fitr is two rak'ahs, and the prayer of Al-Adha is two rak'ahs, and the prayer when traveling is two rak'ahs, complete and not shortened, on the tongue of Muhammad (ﷺ)