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)." (JA)
App reference (JA): Book 14, Hadith 57 (JA)
English reference (JA): Vol. 2, Book 14, Hadith 1421 (JA)
Arabic reference (JA): Book 14, Hadith 1431 (JA)