The Book of Prayer - Travellers
6/14. Chapter:
It is recommended to pray two rak`ah for the sunnah of Fajr. And encouragement to pray them regularly, and to make them brief, and to persist in offering them, and clarifying what is recommended to recite therein
Sahih Muslim
وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى، وَقُتَيْبَةُ، وَابْنُ، رُمْحٍ عَنِ اللَّيْثِ بْنِ سَعْدٍ، ح وَحَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، وَعُبَيْدُ اللَّهِ بْنُ سَعِيدٍ، قَالاَ حَدَّثَنَا يَحْيَى، عَنْ عُبَيْدِ اللَّهِ، ح وَحَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا إِسْمَاعِيلُ، عَنْ أَيُّوبَ، كُلُّهُمْ عَنْ نَافِعٍ، بِهَذَا الإِسْنَادِ كَمَا قَالَ مَالِكٌ .
This hadith has been transmitted by Nafi' with the same chain of narrators.
Reference : Sahih Muslim 723bIn-book reference : Book 6, Hadith 107USC-MSA web (English) reference : Book 4, Hadith 1563