"It does not beautify the first science to neglect the knowledge of the prophetic days and the Islamic dates, and it includes many sciences and important benefits, which is not dispensed with, and it is not excused in the elaboration from them and it includes mentioning the lineage of the Messenger of God, peace and blessings be upon him, and his biography and his biography. His flags, and mentioned the days of Islam after him to this day, which touches the need of the people of four to him, for the short one, God willing.