τούτου· (toutou) in Revelation 22:10: Genitive Singular Neuter

Noun: this form functions as a substantival pronoun, naming a referent in a definite way rather than adding a new lexical idea.

Nominative: this general case label marks a form used for subject or predicate relations, though the local syntax must decide the exact function.

Singular: the form points to one referent in this occurrence, not to a plural set, and context supplies what that single referent is.

Feminine: this grammatical class belongs to the form system and does not by itself make any theological or biological claim.

τοῦ βιβλίου

It stands in a genitive chain after the noun for book, so it most naturally limits that noun by pointing to the particular book already in view.

It identifies the book as this one, the specific book associated with the prophecy just mentioned, and helps the reader hear the phrase as a marked, context-bound reference.

It does not introduce a new subject, and it does not by itself state possession in a full verbal sense beyond the noun relation already present.

High: The demonstrative makes the command about not sealing the prophecy refer to this specific book.

Genitive singular neuter demonstrative. specifies the book already in view. Attached to the book phrase in Revelation 22:10. Governed by the noun phrase about the words of the prophecy. The form narrows reference without introducing a new subject or action.

Which book is being identified? This book, the prophetic writing in view, is being identified.

Direct: The form directly supports this in the phrase this book.

Genitive relation should be read with the surrounding noun chain. Neuter gender is grammatical agreement and should not be turned into a theological claim. The command's force comes from the whole verse, not from the demonstrative alone.

Demonstrative alone defines canon theology: The demonstrative identifies this book in context; broader canonical claims require wider argument. genitive proves possession: The genitive works within the phrase and should not be reduced to ownership language.

The witness reads τούτου within the phrase 'τῆς προφητείας τοῦ βιβλίου τούτου,' so the form belongs to a genitive construction tied to the book of this prophecy.

The lemma οὗτος is a demonstrative pronoun, here used in a genitive singular neuter form to point back to something already named in the sentence.

Because it follows 'the book,' the form most naturally specifies which book is meant, rather than adding a separate proposition or changing the clause focus.

The command not to seal the words is directed to the words of this particular prophetic book, underscoring immediacy and present relevance.

Within the book's closing instructions, the demonstrative helps keep attention on the received prophetic message itself, not on a vague or distant text.

For readers and hearers, the form sharpens the referent: the instruction concerns this book, this prophecy, and this spoken revelation.

Do not press the grammatical gender into theology, do not treat the form as redefining the lemma, and do not let morphology override the immediate context.