How sound is the Hadith: "Black banners will emerge from Khorasan, and nothing will stop them until they are planted in Ilia (Jerusalem)"? Is it authentically reported from the Prophet, peace and blessings be upon him? And if it is authentic, where is Khorasan located?

The hadith narrated by Abu Hurayrah: "Black banners will emerge from Khurasan which nothing will repel until they are planted in Aelia (Jerusalem)" is very weak and not authentic. The reason for its weakness is that its narrator, Rishdin ibn Sa'd, is the only one who narrated it, and he is considered weak by hadith scholars. Al-Tirmidhi and Al-Bayhaqi explicitly stated its weakness, and a number of imams, including Al-Hafiz Ibn Kathir, Ibn Hajar, and Shaykh Al-Albani, weakened it, confirming that nothing authentic exists regarding this matter.