Iraqi worshippers perform the al-Adha feast prayers on the first day of the feast celebrated by Muslims worldwide, at the Mohammed Alamine mosque in the northern city of Mosul, on July 20, 2021. - The al-Adha, or "Feast of Sacrifice", marks the end of the annual pilgrimage or Hajj to the Saudi holy city of Mecca and is celebrated in remembrance of Abraham's readiness to sacrifice his son to God. (Photo by Zaid AL-OBEIDI / AFP)