The journey of al-Israa and al-Miraj had a lot of reasons. First it was a condolence for prophet Mohammad because of the rejection of Quraish to his call and invitation to them to embrace Islam. Second, it was a kind of honoring prophet Mohammad and raising his rank. Third, it was a kind of a message that prophet Mohammad was not alone and that Allah supported and guided him all the time. It was a suitable preparation for the next phase of the prophet’s call to Islam. Fourth, Allah compensated prophet Mohammad for the pains which he felt during his journey to al-Taif whose people treated him very badly.
Allah taught prophet Mohammad a lot of miraculous things and facts. This was to show prophet Mohammad the greatness of the universe, the metaphysical world as well as the greatness of allah. This gave prophet Mohammad the certainty and confidence he needed to go on with his call and invitation. Prophet Mohammad met and saw the previous messengers and prophets to assure him that the life of a prophet and a messenger was not an easy one by any means. Moreover, prophet Mohammad saw scenes of the joy of paradise and the torture which the wrong doers met in hell. This was an additional assurance of the metaphysical facts which he was calling for.
The opinions of the Muslim scholars vary about the time of the journey of al-israa and al-miraj. The most famous and accepted opinion about it was that it happened a year before the migration to al-Madina. It was also after the painful journey to al -taif. the journey was precisely at the night of the twenty-seventh day of the month of Rajab. It was twelve years after the first revelation.
After what had happened at Zamzam, angel Jibril brought al-Buraq to prophet Mohammad to ride. al-Buraq was an animal which was smaller than a horse. It was also bigger than a donkey in size. each step which was as far as its sight could reach. prophet Mohammad sweated heavily as the Buraq was difficult to ride. After that they headed for Jerusalem.