حَدَّثَنَا أَحْمَدُ بْنُ مَنِيعٍ، حَدَّثَنَا هُشَيْمٌ، أَخْبَرَنَا عَلِيُّ بْنُ زَيْدِ بْنِ جُدْعَانَ الْقُرَشِيُّ، عَنْ أَبِي نَضْرَةَ، قَالَ سُئِلَ عِمْرَانُ بْنُ حُصَيْنٍ عَنْ صَلاَةِ الْمُسَافِرِ، فَقَالَ حَجَجْتُ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم فَصَلَّى رَكْعَتَيْنِ وَحَجَجْتُ مَعَ أَبِي بَكْرٍ فَصَلَّى رَكْعَتَيْنِ وَمَعَ عُمَرَ فَصَلَّى رَكْعَتَيْنِ وَمَعَ عُثْمَانَ سِتَّ سِنِينَ مِنْ خِلاَفَتِهِ أَوْ ثَمَانِيَ سِنِينَ فَصَلَّى رَكْعَتَيْنِ ‏.‏ قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ ‏.‏

Abu An-Nadrah said: "Imran bin Husain was asked about the traveler's prayer. He said: 'I performed Hajj with the Messenger of Allah, and he prayed two Rak'ah. I performed Hajj with Abu Bakr, and he prayed two Rak'ah and with Umar, and he prayed two Rak;ah; and with Uthman for six years of his Khilafah, or eight years, and he prayed two Rak'ah." Translation Not Available

Book reference: Jamiya Tirmidhi Book 6 Hadith 545
Web reference: Jamiya Tirmidhi Volume 2 Book 1 Hadith 545