CAIRO, EGYPT - JULY 20: Muslims gather to perform the Eid Al Adha (Feast of the Sacrifice) prayer at the Mosque-Madrasa of Sultan Hassan in Cairo, Egypt on July 20, 2021. Muslims worldwide celebrate Eid Al-Adha, to commemorate the holy Prophet Ibrahim's (Prophet Abraham) readiness to sacrifice his son as a sign of his obedience to God, during which they sacrifice permissible animals, generally goats, sheep, and cows. Eid-al Adha is the one of two most important holidays in the Islamic calendar, with prayers and the ritual sacrifice of animals. Stringer / Anadolu Agency/ABACAPRESS.COM