Some scholars suggest that Nasi' was in fact a practice where the pre-Islamic Arabs used to occasionally add an 'intercalary' month in order to move religious festivals into more lucrative business seasons, rather than simply shifting the date of these festivals, though this is uncertain. However, there were some changes made: whereas the pre-Islamic Arabs allowed a practice Nasi' whereby they would either choose a different set of four months to deem sacred or move about holy festivals to a more appropriate seasons (since the lunar calendar cycles through the seasons), the Islamic calendar system prohibited this practice. The Islamic lunar calendar is the same calendar that was used by the pre-Islamic pagan Arabs, as it refers to the lunar months by the same names and sanctifies the very four of the twelve months that were considered sacred by Arabs in the pre-Islamic period. This is the equivalent of the Hebrew Sabbath, though hosts none of the accompanying rituals or practices This is the day on which Muslim men are required ( fard) to participate in a congregational prayer, generally referred to as the Jumu'ah prayer

Muslims are encouraged to fast on Mondays, as it is the day that Muhammad is said to have been born on This is the fourth 'sacred' month in the Islamic lunar calendar This is the month in which the ritual of Hajj, one of the five pillars of Islam, is carried out

This is the third 'sacred' month in the Islamic lunar calendar This is the month in which the ritual of fasting, one of the five pillars of Islam, is carried out This is the second 'sacred' month in the Islamic lunar calendar This is the first 'sacred' month in the Islamic lunar calendar

Months in islamic calendar