Sahih Bukhari Volume 5, Book 63, Hadith 3878

حَدَّثَنَا مُحَمَّدُ بْنُ الْعَلاَءِ، حَدَّثَنَا أَبُو أُسَامَةَ، حَدَّثَنَا بُرَيْدُ بْنُ عَبْدِ اللَّهِ، عَنْ أَبِي بُرْدَةَ، عَنْ أَبِي مُوسَى ـ رضى الله عنه ـ بَلَغَنَا مَخْرَجُ النَّبِيِّ صلى الله عليه وسلم وَنَحْنُ بِالْيَمَنِ فَرَكِبْنَا سَفِينَةً فَأَلْقَتْنَا سَفِينَتُنَا إِلَى النَّجَاشِيِّ بِالْحَبَشَةِ، فَوَافَقْنَا جَعْفَرَ بْنَ أَبِي طَالِبٍ، فَأَقَمْنَا مَعَهُ حَتَّى قَدِمْنَا، فَوَافَقْنَا النَّبِيَّ صلى الله عليه وسلم حِينَ افْتَتَحَ خَيْبَرَ، فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ لَكُمْ أَنْتُمْ يَا أَهْلَ السَّفِينَةِ هِجْرَتَانِ ‏"‏‏

Narrated By Abu Musa : We received the news of the departure of the Prophet (to Medina) while we were in Yemen. So we went on board a ship but our ship took us away to An-Najashi (the Negus) in Ethiopia. There we met Ja'far bin Abi Talib and stayed with him till we came (to Medina) by the time when the Prophet had conquered Khaibar. The Prophet said, "O you people of the ship! You will have (the reward of) two migrations."