Sahih al-Bukhari, Book 23, Hadith 76 (In-Book) ⓘ
Narrated Abu Huraira: The Prophet (p.b.u.h) informed his companions about the death of An-Najashi and then he went ahead (to lead the prayer) and the people lined up behind him in rows and he said four Takbir.
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ، حَدَّثَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، عَنْ سَعِيدٍ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ قَالَ نَعَى النَّبِيُّ صلى الله عليه وسلم إِلَى أَصْحَابِهِ النَّجَاشِيَّ، ثُمَّ تَقَدَّمَ فَصَفُّوا خَلْفَهُ فَكَبَّرَ أَرْبَعًا.
also referenced under: Hadith 1318 (DarusSalam) & Volume 2, Book 23, Hadith 404 (USC-MSA)