Allah sent the prophets as a mercy to the slaves and supported them with miracles to indicate the truthfulness of their message. Of all the prophets, our Prophet, Muhammad, was blessed with the most miracles. Al-Isra' and al-Mi^raj are among the many miracles of Prophet Muhammad.
The miracle of al-Isra' is confirmed in the Qur'an. In Surat al-Isra', Ayah 1, Allah said:
which means: [Praise be to Allah Who enabled His slave, Muhammad, to make the journey at night from Masjid al-Haram in Makkah to Masjid al-Aqsa in Jerusalem, which is surrounded a blessed land.]
This journey is also confirmed in the sahih hadith. As such, there is scholarly consensus (ijma^) Prophet Muhammad journeyed in body and soul the night of al-Isra' from Masjid al-Haram in Makkah to Masjid al-Aqsain Jerusalem. Moreover, these scholars indicated the person who denies al-Isra' is a blasphemer for belying the explicit text of the Qur'an.
Before the Prophet took this night journey, the ceiling of the house in which he was staying was opened, and Jibril descended. He cut open the chest of Prophet Muhammad and washed that open area with Zamzam water. Then he emptied something from a container into the chest of the Prophet to increase his wisdom as well as the strength of his belief. This was done to prepare the Messenger of Allah for that which he had yet to see in the upper world from among the wonders of the creation of Allah.
After the Prophet performed the Evening Prayer (^Isha'), Jibril came to him with a white animal, slightly larger than a donkey yet smaller than a mule. This animal was the buraq,--one of the animals of Paradise. Jibril held the buraq by his ear and told the Prophet to mount it. When the buraq was mounted, the Prophet set forth.
The buraq is a very fast animal; the length of the buraq's stride is the farthest distance it's eye can see. The Prophet and Jibril arrived to a land with palm trees. Jibril told the Prophet to dismount and pray, so the Prophet dismounted the buraq and prayed two rak^as. Jibril asked him, "Do you know where you prayed?" and the Prophet answered, "Allah knows best." Jibril told him, "This is Yathrib; this is Taybah. "." (These are two names for the city of al-Madinah.) Before the Prophet emigrated to al-Madinah, it was called Taybah and Yathrib. It earned the name al-Madinah after the Prophet emigrated to it.