«إن أول ما نبدأ به في يومنا هذا أن نصلي ثم نرجع فننحر فمن فعل ذلك فقد أصاب سنتنا ومن ذبح قبل ذلك فإنما هو لحم قدمه لأهله ليس من النسك في شيء»
The Prophet (peace and blessings be upon him) said:
"Indeed, the first thing we begin with on this day of ours (the day of Eid al-Adha) is that we first offer the prayer, then return and offer the sacrifice. Whoever does that has attained our Sunnah, and whoever slaughters before that (prayer), it is merely meat which he has prepared early for his family; it has nothing to do with the rites of sacrifice."
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 2019