Pakistani Muslim devotees slaughtering cows after Eid al-Adha, the Festival of Sacrifice (Qurbani) prayer at Darul Uloom Jamia Naeemia Mosque with SOP's in Lahore. Muslims are celebrating Eid al-Adha or Feast of Sacrifice, the second of two Islamic holidays celebrated worldwide marking the end of the annual pilgrimage or Hajj to the Saudi holy city of Mecca and marks the willingness of the Prophet Ibrahim, Abraham to Christians and Jews, to sacrifice his son. During the holiday, which in most places lasts four days, Muslims Slaughtering sheep, goats, cows and camels to commemorate Prophet Abraham's willingness to sacrifice his son Ismail on God's command, distribute part of the meat to the poor.