Thus in their letters, the apostles often referred to fellow disciples as ‘ brothers and sisters. ’ ​ — Rom.
فَلَا عَجَبَ إِذًا أَنَّ ٱلرُّسُلَ دَعَوْا رُفَقَاءَهُمُ ٱلْمَسِيحِيِّينَ « إِخْوَةً » فِي رَسَائِلِهِمْ إِلَى ٱلْجَمَاعَاتِ .‏