Bulugh al-Maram, Book 3, Hadith 25 (In-Book)

Abu Hurairah (RAA) narrated that the Messenger of Allah informed the people about the death of Negus the day he died. He took them out to the place of prayer, to offer the funeral prayer for him. He arranged them in rows, and made Takbir four times.’ Agreed upon.

وَعَنْ أَبِي هُرَيْرَةَ ‏- رضى الله عنه ‏- { أَنَّ اَلنَّبِيَّ ‏- صلى الله عليه وسلم ‏-نَعَى اَلنَّجَاشِيَّ فِي اَلْيَوْمِ اَلَّذِي مَاتَ فِيهِ, وَخَرَجَ بِهِمْ مِنَ الْمُصَلَّى، فَصَفَّ بِهِمْ, وَكَبَّرَ عَلَيْهِ أَرْبَعًا } مُتَّفَقٌ عَلَيْهِ 1‏.‏ ‏1 ‏- صحيح.‏ رواه البخاري (1245)‏، ومسلم (951)‏ (62)‏.‏

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also referenced under: Book 3, Hadith 581 (English)