Isra and Mi'raj is a grand festival celebrated on the 27th day of Rajab, which is the seventh month in the Islamic calendar. The festival is also known as the Night Journey, Ascension to Heaven and The Prophet's Ascension.
According to the Quran and hadith, the Night Journey begins with Prophet Muhammad travelling with angel Gabriel to the Al-Aqsa Mosque in Jerusalem on the steed Buraq. It is believed that here he met and prayed with many prophets. This part of the journey is known as Isra.
Prophet Muhammad then ascended to paradise with angel Gabriel and spoke to God Himself. This part of the journey is what is known as Mi'raj. It is believed that initially, God required a man to pray 50 times a day. But after Prophet Muhammad went back to God a number of times and requested for this number to be reduced, it was brought down to five. This holy commandment has been faithfully kept by countless generations of Muslims throughout the ages.
These events are believed to have taken place 621 CE.