Muslims Offer Prayers and Sacrifices to Mark Eid Al-Adha Muslims mark Eid al-Adha or the Festival of Sacrifice in commemoration of Prophet Abraham's readiness to sacrifice his son to show obedience to Allah.An elderly Muslim man poses for a portrait at a mosque during the festival of Eid-al-Adha in Bangkok, Thailand on September 24.JORGE SILVA / ReutersPrintSept. 25, 2015, 9:22 AM UTC / Updated Sept. 25, 2015, 9:22 AM UTC