πορνείαν. (porneian) in 1 Corinthians 6:18: Noun Accusative Singular Feminine

Noun: the form names the thing or category that Paul commands the readers to flee.

Accusative: the form most naturally marks the direct object of the command φεύγετε.

Singular: the form presents sexual immorality as one named category in the command.

Feminine: the noun's grammatical gender is a language feature and does not create a gendered claim about the sin.

φεύγετε

The accusative form is governed by the imperative φεύγετε, which names what the readers are to flee.

It functions as the object of the command, placing sexual immorality before the reader as the thing to avoid decisively.

It is not the subject of the sentence and does not by itself explain every reason Paul gives in the body-focused argument.

High: The accusative noun is the direct object of the command to flee, making the object of obedience clear.

Accusative object of an imperative. names what the readers are commanded to flee. Attached to the command to flee. Governed by the imperative verb. The grammar makes the command direct; Paul's wider body-and-union argument gives the reason.

What are the readers commanded to flee? Sexual immorality is the accusative object of the command.

Direct: The form directly supports rendering the noun as the object of "flee."

The noun names the object of the command, but the passage must define the ethical and theological reasons.

Grammar alone supplies the whole sexual ethic: The form identifies what is commanded; the passage supplies the moral reasoning and guardrails.

The witness reads πορνείαν in 1 Corinthians 6:18 immediately after φεύγετε.

The lemma πορνεία names sexual immorality broadly, and this occurrence uses that lexeme in an ethical command.

The accusative case fits the object role under the imperative, so the grammar supports a direct command to flee this named practice.

In context Paul connects the command to the body, holiness, and belonging to the Lord, so the form serves a larger theological argument.

This use fits the wider biblical pattern of treating sexual sin as morally serious, while the verse's body language gives this passage its own emphasis.

For teaching, the form helps readers hear Paul's command as concrete: flee sexual immorality, not merely think differently about it.

Do not derive the whole doctrine of the body from the accusative case alone, and do not reduce Paul's argument to grammar without the surrounding verses.