﴿ وَفُتِحَتِ ٱلسَّمَآءُ فَكَانَتْ أَبْوَٰبًۭا ﴾

“and when the skies are opened and become [as wide-flung] gates;”

and the heaven is opened read futtihat or futihat sundered for the descent of the angels and becomes as gates it becomes a heaven with gates