The Prophet ﷺ 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.
نَعَى النَّبِيُّ ﷺ إِلَى أَصْحَابِهِ النَّجَاشِيَّ ثُمَّ تَقَدَّمَ فَصَفُّوا خَلْفَهُ فَكَبَّرَ أَرْبَعًا