History of Ramadan came because Muslims believe that it was during the month of Ramadan that the Koran was first revealed in its entirety to Prophet Muhammad by the angel Gabriel on what is known as Laylat al-Qadr. According to the Koran, fasting is mandatory for all Muslims for the entire thirty days of the month. But there are some group that do not have to fast, like Pregnant or breastfeeding mothers, people that seriously sick, or travelers. And also for the children who have not gone through puberty are also not required to fast during the month.