Sahih al-Bukhari 494
صحيح البخاري#494SahihNarrated Ibn `Umar:Whenever Allah's Messenger (ﷺ) came out on `Id day, he used to order that a Harba [??] (a short spear) to be planted in front of him (as a Sutra for his prayer) and then he used to pray facing it with the people behind him and used to do the same while on a journey. After the Prophet (ﷺ) , this practice was adopted by the Muslim rulers (who followed his traditions)
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: 8:141