Pray First then Slaughter on the Day of Eid ul Adha

Narrated Al-Bara’ (Radiyallaahu `anhu): I heard the Prophet (Sallallaahu `alayhi wa sallam) delivering a Khutba saying,

“The first thing to be done on this day (first day of ‘Id ul Adha) is to pray; and after returning from the prayer we slaughter our sacrifices (in the name of Allah) and whoever does so, he acted according to our Sunna (traditions).”

Bukhari Volume 2, Book 15, Number 71