It was narrated from 'Abdur-Rahman bin Abi Laila that 'Umar said:
"Jumu'ah prayer is two rak'ahs, the prayer of Al-Fitr is two rak'ahs, the prayer of Al-Adha is two rak'ahs, the prayer when traveling is two rak'ahs, complete and not shortened, on the tongue of Muhammad (ﷺ)." (RU)
App reference (RU): Book 14, Hadith 57 (RU)
English reference (RU): Vol. 2, Book 14, Hadith 1421 (RU)
Arabic reference (RU): Book 14, Hadith 1431 (RU)