Concerning the people of Paradise, He says: “Until, when they reach it and its gates are opened,” with the letter wāw (“and”). In His description of Hell, He says: “Until, when they reach it, its gates are opened,” without wāw.
One group said: “This is the ‘wāw of eight.’ It appears in connection with the gates of Paradise because they are eight, whereas the gates of Hell are seven, so wāw does not appear there.” This is a weak opinion with no evidence to support it. Neither the Arabs nor the leading authorities on Arabic recognize it; it is merely an inference drawn by some later scholars.
Another group said: “The wāw is superfluous, and the verb following it supplies the result clause, as in the second verse.” This too is weak, for a superfluous wāw is unknown in their speech. Even the most foolish speech ought not to contain a superfluous letter that conveys no meaning and serves no purpose.
A third group said: “The result clause is omitted, and His words, ‘and its gates are opened,’ are joined by conjunction to His words, ‘they reach it.’” This is the view preferred by Abū ʿUbaydah, al-Mubarrad, al-Zajjāj and others.
Al-Mubarrad said: “According to the scholars, omitting the result clause is more eloquent.”
Abū al-Fath Ibn Jinnī said: “Our colleagues reject the notion of a superfluous wāw and do not permit it. They hold that the result clause is omitted because it is understood.”
The question remains: what is the subtle purpose behind omitting the result clause in the verse concerning the people of Paradise while stating it in the verse concerning the people of Hell?
The answer is that this is more eloquent in both passages. The angels drive the people of Hell towards it while its gates are closed. When they reach it, its gates are opened in their faces, and the punishment takes them suddenly by surprise. Thus, the moment they reach it, its gates are opened without delay. This is the nature of a result dependent upon a condition: it follows immediately upon it. Hell is the abode of humiliation and disgrace, so permission is not sought for them to enter it, nor are its keepers asked to allow them to