Muslim Christmas is called Eid al-Adha. It is a religious festival celebrated by Muslims worldwide to commemorate the sacrifice of Prophet Ibrahim, also known as Abraham in the Bible, to Allah (God) when he was willing to sacrifice his son Ismail (Ishmael) as a sign of obedience and devotion to Allah. Eid al-Adha is a four-day festival that is typically celebrated in the ninth month of the Islamic calendar, known as Dhu al-Hijjah. It is marked by feasting, prayer, and charitable giving.