At the beginning of the 8th century, Ibn Ishaq codified the earliest Arabic source pertaining to the Jerusalem Rock, as part of his "Sirat al-Nabi", a biography of the Islamic prophet Muhammad, introducing the notion that right after the Prophet's Night Journey from Mecca to Jerusalem ("isra"'), he set off immediately and specifically from the Rock in his Ascension ("mi'raj") to Heaven, where God instructed him in the doctrines of the new religion. Judging though by the early Muslim sources, this doesn't seem to have been yet a fully formulated part of the beliefs shared by Muslims during the construction of the Dome in the eighth century, and the inscriptions inside the dome attributing the building to Caliph 'Abd al-Malik in the year 691/2 do not refer at all to the Night Journey, but contain only the Koranic view on the nature of the prophet Isa (Jesus) instead.