Sunan an-Nasa'i, Hadith 1440 ⓘ
It was narrated that 'Umar said: "The prayer for jumu'ah is two rak'ahs, and for Al-Fitr is two rak'ahs, and for An-Nahr is two rak'ahs, and for traveling is two rak'ahs, complete and not shortened, on the tongue of the Prophet."
أَخْبَرَنَا حُمَيْدُ بْنُ مَسْعَدَةَ، عَنْ سُفْيَانَ، - وَهُوَ ابْنُ حَبِيبٍ - عَنْ شُعْبَةَ، عَنْ زُبَيْدٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى، عَنْ عُمَرَ، قَالَ صَلاَةُ الْجُمُعَةِ رَكْعَتَانِ وَالْفِطْرِ رَكْعَتَانِ وَالنَّحْرِ رَكْعَتَانِ وَالسَّفَرِ رَكْعَتَانِ تَمَامٌ غَيْرُ قَصْرٍ عَلَى لِسَانِ النَّبِيِّ صلى الله عليه وسلم .
also referenced under: Book 15, Hadith 8 (In-Book) & Volume 2, Book 15, Hadith 1441 (DarusSalam)