The Gates of Hell

"The unbelievers will be led to Hell in crowds until, when they arrive
there, its gates will be opened.."
[az-Zumar, 39: 71]
"And verily, Hell is the promised abode for them all. It has seven
gates: to each of those gates is a specific class ofsinners assigned."
[al Hijr, 15: 43-44]
"To them will be said, 'Enter you the gates of Hell to dwell therein.
And how evil is this abode of the arrogant.'"
[az Zumar, 39: 72]
"But those who reject Our signs are the companions of the left hand -
on them will be fire vaulted over."
[al Balad, 90: 19-20]
In Arabic, the phrase "onthem will be fire vaulted over" indicates
that the gates of Hell be closed. In other words, the fire will
encompass the companions of the Fire, and the gates of Hell
willimprison them within. Aswell, the gates of Hell will be locked,
vaulted all around, and outstretched columns will cover the doors.
"It is the fire of Allah, kindled to a blaze, whichmounts right to the
hearts. It will be a vault over them in outstretched columns."
[al Humazah, 104: 6-9]
Abu Hurairah (radiAllahuanhu) narrated that Allah's Messenger
(salAllahu alayhi wasalam) said: 'When the month of Ramadan begins and
the gates of Heaven are opened, the gates of Hell are closed, and the
devils are chained."
[Sahih al-Bukhari]