πορνεία, (porneia) in 1 Corinthians 5:1: Noun Nominative Singular Feminine

Noun: the form names the reported sin as a category rather than expressing an action by itself.

Nominative: the form stands in a subject-like or naming role in the reported statement.

Singular: the form presents the reported matter as one category, even though the verse repeats the word for emphasis.

Feminine: the noun belongs to the feminine grammatical class, which is not a claim about biological gender.

τοιαύτη

The form sits in the reported clause introduced by ἀκούεται and is sharpened by τοιαύτη, such a kind of immorality.

It names the reported offense and, in this second occurrence, intensifies the report by describing it as a particular kind of sexual immorality.

It is not a private aside or a generic dictionary label, and the nominative form alone does not define the church's whole response.

High: The nominative noun names the reported offense in a public church matter, but the chapter supplies the response.

Nominative subject of a reported matter. names the offense being reported. Attached to the report of such sexual immorality. Governed by the clause that says the matter is being heard or reported. The form names the category in this case; it should not collapse every use of the lemma into this exact situation.

What offense is being reported in the church? The nominative noun names sexual immorality as the reported matter.

Direct: The form directly supports rendering the term as the named reported offense.

The verse describes a specific case and category; application must follow Paul's argument rather than the morphology alone.

One occurrence defines every sexual-ethics case: This form names the offense in this verse; other passages must be interpreted in their own contexts. feminine noun assigns blame to women: Feminine is grammatical gender for the noun, not a claim about who is morally responsible.

The witness reads πορνεία twice in 1 Corinthians 5:1; this guide is anchored to the second occurrence in καὶ τοιαύτη πορνεία.

The lemma πορνεία names sexual immorality broadly, and this passage identifies a concrete case that even the surrounding nations would not approve.

The nominative form names the offense in the report, while τοιαύτη marks it as a specific and shocking kind of the named sin.

In context Paul is not merely defining a word; he is addressing a public moral crisis in the church that requires discipline and holiness.

This use fits the wider biblical concern for covenant holiness among God's people, without making every use of πορνεία identical to this case.

For teaching, show how the repeated noun names the problem plainly and intensifies the seriousness before Paul gives pastoral correction.

Do not treat the nominative case as if it alone commands church discipline, and do not flatten every occurrence of πορνεία into this specific incestuous case.