Sahih al-Bukhari 1531
صحيح البخاري#1531SahihNarrated Ibn `Umar:When these two towns (Basra and Kufa) were captured, the people went to `Umar and said, "O the Chief of the faithful believers! The Prophet (ﷺ) fixed Qarn as the Miqat for the people of Najd, it is beyond our way and it is difficult for us to pass through it." He said, "Take as your Miqat a place situated opposite to Qarn on your usual way. So, he fixed Dhatu-Irq (as their Miqat)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 25:19