Sahih Bukhari · Hadith 4763
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) - كتاب التفسير
حدثنا علي بن عبد الله، حدثنا سفيان، عن عمرو، عن عكرمة، عن ابن عباس رضى الله عنه {وما جعلنا الرؤيا التي أريناك إلا فتنة للناس} قال هي رؤيا عين أريها رسول الله صلى الله عليه وسلم ليلة أسري به {والشجرة الملعونة} شجرة الزقوم.
Narrated Ibn `Abbas: Regarding: 'And We granted the vision (Ascension to the Heaven "Miraj") which We showed you (O Muhammad as an actual eye witness) but as a trial for mankind.' (17.60) It was an actual eyewitness which was shown to Allah's Apostle during the night he was taken on a journey (through the heavens). And the cursed tree is the tree of Az-Zaqqum (a bitter pungent tree which grows at the bottom of Hell).
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).