(Imām Bukhārī narrates): Ibrahim bin al-Mundhir narrated to us, he said: al-Walid narrated to us, he said: Abu Amr narrated to us, he said: Nafi' informed me from Ibn Umar, may Allāh be pleased with them both, he said that
the Prophet ﷺ used to go to the place of Eid prayer in the morning, and a spear would be carried in front of him and planted in front of him at the place of prayer, then he would pray towards it.
Reference: Sahih Al Bukhari 973