question #1 Sahih al-Bukhari 5500, Book 72, Hadith 26 : What is the significance of performing the Eid prayer before slaughtering the sacrificial animal?

Once during the lifetime of Allah’s Messenger (ﷺ) we offered some animals as sacrifices. Some people
slaughtered their sacrifices before the (Id) prayer, so when the Prophet (ﷺ) finished his prayer, he saw that
they had slaughtered their sacrifices before the prayer. He said, “Whoever has slaughtered (his
sacrifice) before the prayer, should slaughter (another sacrifice) in lieu of it; and whoever has not yet
slaughtered it till we have prayed; should slaughter (it) by mentioning Allah’s Name.”