Sunan an-Nasa'i 1420
سنن النسائي#1420SahihIt 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)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 14:57