ISRA' MI'RAJ

Isra Mi'raj (Arabic: الإسراء والمعراج, al-'Isra' wal-Mi'rāğ) are two parts of a journey undertaken by Muhammad in one night alone. This incident is one of the important event for Muslims, because in the event of Prophet Muhammad sallallaahu alaihi wa sallam ordered to perform prayers five times a day.
Isra Mi'raj took place during the end of prophethood in Mecca before the Prophet sallallaahu alaihi wa sallam migrated to Madinah. According to al-Mawdudi [1] and the majority of scholars, [2] Isra Mi'raj occurred in the first year before the hijrah, that between the years 620-621 AD According to al-Allamah al-Manshurfuri, Isra Mi'raj occurred on the night of 27 Rajab, the 10th year of

KHULAFAUR RASYIDIN ( Four Caliphs )

First four caliphs (Arabic: الخلفاء الراشدون) or Ar-Rashidun Caliph were four Caliphs (leaders) of Islam first, believed by Muslims as the successor to the leadership of the Prophet Muhammad after his death. Four of these were recorded Muhammad's closest and best known in the defense of the teachings he brought in the time of Muhammad's prophethood. The four caliphs were chosen not by his descendants, but by the consensus of the Muslims .
Electoral systems for each different caliphs, it was because of the friends assume no obvious references left by Prophet Muhammad about how the Islamic leadership succession will take place.