Israa is an Arabic word referring to Prophet Muhammad's miraculous night journey from Makka to Jerusalem; it is believed to have been followed by the Mi'raj, his ascension to heaven.
Why is it important?
Within Islam, Isra and Mi'raj, celebrated on the 27th day of the 7th month of the Muslim calendar, refers to a miraculous nighttime journey undertaken by the Prophet Muhammad, in two legs.
First from Mecca to Jerusalem, and then from Jerusalem to the heavens. Believers consider it both a physical and a spiritual journey that was assisted by Allah himself — for example, by providing Muhammad with a pegasus-like steed, the Buraq, to ride during the first part of the journey.