﴿ وَلَوْ فَتَحْنَا عَلَيْهِم بَابًۭا مِّنَ ٱلسَّمَآءِ فَظَلُّوا۟ فِيهِ يَعْرُجُونَ ﴾

“Yet even had We opened to them a gateway to heaven and they had ascended, on and on, up to it,”

(And even if We opened unto them) unto the people of Mecca (a Gate of Heaven) from which to enter (and they kept mounting through it) and they kept ascending and descending through it, i.e. like the angels.