Hadith 1447

It was narrated from Anas bin Malik that he said: "I prayed two rak'ahs with the Messenger of Allah (SAW) in Mina, and with Abu Bakr and 'Umar, and two rak'ahs with 'Uthman at the beginning of his Caliphate."

أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنْ بُكَيْرٍ، عَنْ مُحَمَّدِ بْنِ عَبْدِ اللَّهِ بْنِ أَبِي سُلَيْمٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّهُ قَالَ صَلَّيْتُ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم بِمِنًى وَمَعَ أَبِي بَكْرٍ وَعُمَرَ رَكْعَتَيْنِ وَمَعَ عُثْمَانَ رَكْعَتَيْنِ صَدْرًا مِنْ إِمَارَتِهِ ‏.‏

Reference: 1114550
In-book reference: Book 15, Hadith 1447
Hadith 1447 - The Book of Shortening the Prayer When Traveling - Sunan an-Nasa'i - Sunnah.com