"Black standards will come from Khurasan, nothing shall turn them back until they are planted in Jerusalem." (Using translation from Tirmidhī 2269)
عَنْ رَسُولِ اللهِ ﷺ أَنَّهُ قَالَ يَخْرُجُ مِنْ خُرَاسَانَ رَايَاتٌ سُودٌ لَا يَرُدُّهَا شَيْءٌ حَتَّى تُنْصَبَ بِإِيلِيَاءَ