The Apostle of Allah (ﷺ) set up (sutra), and Abu Bakr said: He implanted iron-tipped spear and said prayer towards its direction. Ibn Abu Shaiba made this addition to it:" Ubaidullah said that it was a spear."
Sahih Muslim Book 4, Hadith 278
← Previous Hadith When the Messenger of Allah (may peace he upon him) went out on the 'Id day, he ordered to carry a spear-and it was fixed in front of him, and he said prayer towards its (direction), and the people were behind him. And he did it in the journey, and that is the reason why the Amirs carried it.

Sahih Muslim Book 4, Hadith 277 Next Hadith → The Apostle of Allah (ﷺ) used to place his camel (towards the Ka'ba) and said prayer in its direction.

Sahih Muslim Book 4, Hadith 279