The Messenger of Allah ﷺ gave us the news of the death of Negus, the ruler of Abyssinia, on the day when he died, and he said (to us): Beg pardon for your brother. Ibn Shihab said that Sa'id b. Musayyib had told that Abu Huraira had narrated to him that the Messenger of Allah ﷺ drew them up in a row in a place of prayer, and offered prayer and recited four takbirs for him. (Using translation from Muslim 951b)
نَعَى لَنَا رَسُولُ اللهِ ﷺ النَّجَاشِيَّ صَاحِبَ الْحَبَشَةِ فِي الْيَوْمِ الَّذِي مَاتَ فِيهِ فَقَالَ اسْتَغْفِرُوا لِأَخِيكُمْ قَالَ ابْنُ شِهَابٍ وَحَدَّثَنِي سَعِيدُ بْنُ الْمُسَيِّبِ أَنَّ أَبَا هُرَيْرَةَ حَدَّثَهُ أَنَّ النَّبِيَّ صَلَّى اللهَ عَلَيْهِ وَسَلَّمَ صَفَّ بِهِمْ بِالْمُصَلَّى وَكَبَّرَ أَرْبَعَ تَكْبِيرَاتٍ