Narrated Ibn 'Abbas: Regarding the Statement of Allah" "And We granted the vision (Ascension to the heavens) which We made you see (as an actual eye witness) was only made as a trial for the people." (17.60) Ibn Abbas added: The sights which Allah's Apostle was shown on the Night Journey when he was taken to BaitulMaqdis (i.e. Jerusalem) were actual sights, (not dreams). And the Cursed Tree (mentioned) in the Quran is the tree of Zaqqum (itself) .

— Sahih Bukhari, Volume 5, Book 58: Merits of the Helpers in Madinah (Ansaar), Hadith #228