It was narrated from Ibn ‘Umar that the Messenger of Allah (ﷺ) used to set out for the praying place in the morning of the day of ‘Eid, and a small spear would be carried before him. When he reached the praying place, it would be set up in front of him, then he would pray facing it, and that was because the praying place was an open space in which there was nothing that could serve as a Sutrah*. *Sutrah (screen), meaning a barrier of some type.
Hadith Referenceسنن ابن ماجه / كتاب إقامة الصلاة والسنة / 1304
´It was narrated that Ibn ‘Umar said:` “When the Prophet (ﷺ) prayed on the day of ‘Eid or on another occasion, a small spear was set up in front of him, and he prayed facing it, and the people were behind him.” Nafi` said: It is from here that the leaders have taken this practice.
Hadith Referenceسنن ابن ماجه / كتاب إقامة الصلاة والسنة / 1305
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:بخاري ومسلم