(Middle Persian: , Persian: Xorāsān/Xorâsân ) is a historical region lying in the northeast of Persia. “In pre-Islamic and early Islamic times, the term “Khurassan” frequently had a much wider denotation, covering also parts of Central Asia and Afghanistan; early Islamic usage often regarded everywhere east of western Persia, so-called Djibal or what was subsequently termed ‘Irak ‘Adjami, as being included in a vast and ill-defined region of Khurasan, which might even extend to the Indus Valley and Sind.”
حَدَّثَنَا رَوْحٌ قَالَ حَدَّثَنَا ابْنُ أَبِي عَرُوبَةَ عَنْ أَبِي التَّيَّاحِ عَنِ الْمُغِيرَةِ بْنِ سُبَيْعٍ عَنْ عَمْرِو بْنِ حُرَيْثٍ عَنْ أَبِي بَكْرٍ الصِّدِّيقِ قَالَ حَدَّثَنَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنَّ الدَّجَّالَ يَخْرُجُ مِنْ أَرْضٍ بِالْمَشْرِقِ يُقَالُ لَهَا خُرَاسَانُ يَتَّبِعُهُ أَقْوَامٌ كَأَنَّ وُجُوهَهُمْ الْمَجَانُّ الْمُطْرَقَةُ.
It was narrated that Abu Bakr as-Siddeeq said:
The Messenger of Allah (ﷺ) said: “The Dajjal will emerge from a land in the east called Khurasan and he will be followed by peoples whose faces are like hammered shields.”
Musnad Ahmed 12
Arabic/English book : Book 1, Hadith 12