When the Event befalls

to His saying, Most High:

And you will be three categories.

Until, when they reach it and its gates are opened

And that Allah may purify those who believe

The Fa of Connection:

Likewise, the Fa is also extra (to emphasize connection):

Al-Qastalani said in the commentary of the Book of Hajj in the chapter "The Umrah performer when he performs the Tawaf of Umrah then goes out, does it suffice him from the farewell Tawaf":

And it is permissible for the conjunction to intervene between the adjective and the described

to emphasize its close adherence to the described

such as:

When the hypocrites and those in whose hearts is disease say

Sibawayh said:

"It is like 'I passed by Zayd and your companion'"

when you intend Zayd by your companion.

And Al-Zamakhshari said regarding His saying, Most High:

"And We did not destroy any town except that it had a known decree."

A sentence occurring as an adjective for a town.

And the standard rule is that the Waw does not intervene between them

as in His saying, Most High:

"And We did not destroy any town except it had warners."

It only intervened to emphasize the close adherence of the adjective to the described.

As it is said in the circumstantial clause:

"Zayd came to me [while] upon him is a garment"

"and [Zayd] came to me [while] upon him is a garment"