Quran 44:41

يَوۡمَ لَا يُغۡنِى مَوۡلًى عَن مَّوۡلً۬ى شَيۡـًٔ۬ا وَلَا هُمۡ يُنصَرُونَ ٤١

That is the day when no friend can help his friend in any way; no one can be helped.