“The night of mi’raj is the one on which the Prophet revisited his original abode … It is not that only Hazrat ‘Ali’s progeny can attain this status. Whoever is determined enough will be able to reach the goal. It can come in stages, through repeated efforts.”
– Imam Sultan Muhammad Shah Aga Khan III, (September 29, 1899)

In the traditional, exoteric (zahir) understanding of Mi’raj (ascension), the Prophet Muhammad travels from the Ka’bah in Makkah to the Sacred Masjid in Jerusalem on the winged horse Buraq. In Jerusalem, after the Prophet Muhammad led a prayer of all Prophets, Buraq ascended with the Prophet through the seven heavens, after which the Prophet experienced his vision of Allah. However, in Ismaili philosophy, the mi’raj considers this understanding as symbolic of a deeper, esoteric (batin) explanation, or ta’wil. Read more below.

Source: Mi‘raj: Spiritual Ascension of Prophet Muhammad in Ismaili Thought ~ Ismaili Gnosis