Ἰουδαίου, (Ioudaiou) in Romans 3:1: Adjective Genitive Singular Masculine

Adjective: the word functions as a descriptive or relational modifier that can name an associated person or quality in context.

Genitive: the form normally marks a dependent relationship, often describing possession, source, reference, or association in the clause.

Singular: the form is grammatically singular here, so it refers to one shared relationship or category in this expression.

Masculine: the form takes masculine grammatical agreement, which here reflects concord and does not by itself make a gendered theological claim.

It is attached to τοῦ in the phrase τοῦ Ἰουδαίου and sits within τὸ περισσὸν τοῦ Ἰουδαίου.

It is governed by the article-noun phrase that asks about the advantage or surplus connected with the Jew, so it functions as a genitive qualifier in the question.

It identifies the relationship as belonging to or associated with the Jew, helping specify whose advantage is being discussed.

It does not by itself state a separate predicate, introduce a new topic, or force a complete theological conclusion apart from the question asked.

High: The genitive adjective substantively identifies the person or group whose advantage Paul asks about.

Genitive singular adjective used substantively. marks the advantage as associated with the Jew. Attached to the advantage question in Romans 3:1. Governed by the noun phrase asking what advantage belongs to the Jew. The form narrows the question to Jewish advantage while the following verse answers what that advantage is.

Whose advantage is being asked about? The genitive identifies the advantage as the advantage of the Jew.

Direct: The form directly supports wording such as "the advantage of the Jew" or "the Jew's advantage."

The adjective functions substantively here, so it names the Jewish person or category rather than merely describing another visible noun. The grammar identifies the question but does not by itself evaluate covenant privilege, ethnic identity, or moral standing.

Substantive adjective turns identity into a value judgment: The form identifies the category in the question; the argument supplies the evaluation. genitive case alone defines covenant status: The genitive marks association with advantage, while Romans 3 develops the theological answer.

The witness reads Ἰουδαίου in Romans 3:1, matching the genitive singular masculine form in the received text tradition provided here.

The lemma Ἰουδαῖος refers to a Judean or Jew, so the form points to that identity or association rather than changing the lexeme itself.

In this question, the genitive relation ties the advantage to the Jew and frames the line as asking what advantage belongs to that group.

The verse asks what benefit or surplus belongs to the Jew and then immediately compares that with the usefulness of circumcision.

Within Romans 3:1, the form serves a discussion about covenant privilege and summary advantage, but the larger argument still determines how that privilege is evaluated.

For readers and teachers, the form supports a precise rendering such as 'of the Jew' or 'the Jew's,' while keeping the emphasis on the question of advantage.

Do not derive from the grammatical form alone a full doctrine about ethnicity, status, or moral worth, and do not let morphology override the verse's question.