(13) باب الصَّلاَةِ إِلَى الْحَرْبَةِ يَوْمَ الْعِيدِ
Narrated Ibn `Umar:
On the day of `Id-ul-Fitr and `Id-ul-Adha a spear used to be planted in front of the Prophet (as a Sutra for the prayer) and then he would pray.
Reference: Sahih al-Bukhari 972
In-book reference: Book 13, Hadith 21
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 15, Hadith 89