in what was revealed to Muḥammad, and in what was revealed to the messengers before him.

And others said: Rather, He meant thereby those who believe in what was revealed to Muḥammad (Peace and blessings of God be upon him) and in what was revealed to those before him; and they are the believers from among the People of the Book who believed in Muḥammad (Peace and blessings of God be upon him) and in what he brought, having previously believed in all the rest of the prophets and books.

And according to this latter interpretation, it is possible for {and those who believe in what was revealed to you} to be in the genitive case or in the nominative case.

As for the nominative case in it, it comes from two aspects: one of them is by way of conjunction to the mention of "those who" in "believe in the unseen"; and the second is that it is the predicate of a subject, or that "they are upon guidance from their Lord" is its raiser.

As for the genitive case, it is by conjunction to "the God-fearing". And if it is conjunctionally linked to "those who", two aspects of meaning are directed toward it: one of them is that it and the first "those who" are descriptions of the God-fearing. And that is according to the interpretation of whoever holds that the four verses after "Alif, Lām, Mīm" were revealed regarding a single category of believers. The second aspect is that the second "those who" is conjunctionally linked in grammatical inflection to "the God-fearing" in the sense of the genitive case, while in meaning they are a category other than the first category. And that is according to the school of whoever holds that those regarding whom the first two verses were revealed among the believers after His statement "Alif, Lām, Mīm" are other than those regarding whom the last two verses following the first two were revealed.

And it may be possible for the second "those who" to be in the nominative case in this aspect in the sense of a fresh inception (1), since it is begun with after the completion of a verse and the conclusion of a story. And the nominative case in it may also be permissible with the intention of fresh inception, since it occurs at the beginning of a verse, even if it is a description of the God-fearing.

So the nominative case is valid in it from four aspects, and the genitive case from two aspects.

And the most preferable of interpretations in my view for His statement {They are upon guidance from their Lord} is what I mentioned from the statement of Ibn Masʿūd and Ibn ʿAbbās, and that "they" is a demonstration pointing to both groups—meaning: