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https://dailybenefits.abdurrahman.org/2017/08/28/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/
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