وَفُتِحَتِ السَّمَاءُ فَكَانَتْ أَبْوَابًا (19)
(78:19) and when the sky shall be opened up and will become all doors;
*12) This implies the final sounding of the Trumpet at which all dead men will rise back to life forthwith. "You" implies not only those who were the addressees at that time but all those humans who will have been born from the beginning of creation till Resurrection. (For explanation, see E.N. 57 of Ibrahim, E.N. 1 of AlHajj, E.N.'s 46, 47 of Ya Sin, E.N. 79 of Az-Zumar).