the Messenger of Allah had told them of the death of An-Najashi, the ruler of Ethiopia, on the day that he died, and he said: "Pray for forgiveness for your brother." (Using translation from Nasāʾī 1879)
أَنَّ رَسُولَ اللهِ ﷺ نَعَى لَهُمُ النَّجَاشِيَّ صَاحِبَ الْحَبَشَةِ فِي الْيَوْمِ الَّذِي مَاتَ فِيهِ وَقَالَ «اسْتَغْفِرُوا لِأَخِيكُمُ»