ἁμαρτιῶν. (amartion) in Matthew 26:28: Noun Genitive Plural Feminine

Noun: the form names a person, place, thing, quality, or concept in the clause.

Genitive: the noun specifies what the forgiveness concerns.

Plural: the form refers to sins as more than one offense or sin-reality in this phrase.

Feminine: the feminine form marks grammatical class and does not by itself make a theological gender claim.

ἄφεσιν

The noun stands in a genitive relation with forgiveness.

It specifies that the forgiveness named in Jesus' saying concerns sins.

It does not by itself define every biblical category of sin or the whole doctrine of forgiveness.

High: The noun specifies what forgiveness concerns in Jesus' cup saying.

Genitive completing forgiveness. specifies sins as the object or concern of forgiveness. Attached to ἄφεσιν. Governed by the forgiveness phrase in Matthew 26:28. The noun should be read with forgiveness and the blood-of-covenant statement.

Forgiveness of what? Forgiveness of sins.

Direct: The form directly supports the rendering "of sins."

The plural names sins but should not be used to quantify sin beyond the context.

Plural sins becomes a full hamartiology: This occurrence specifies forgiveness of sins in Matthew 26:28; broader doctrine requires broader evidence.

The witness reads ἁμαρτιῶν. in Matthew 26:28.

The lemma ἁμαρτία means sin, and here the plural genitive names the sins related to forgiveness.

The genitive plural completes ἄφεσιν, specifying forgiveness of sins.

Jesus' blood of the covenant is poured out for many for forgiveness of sins.

The form fits Matthew's opening claim that Jesus saves his people from their sins and the passion narrative's explanation of his death.

In teaching, connect the genitive to forgiveness so the phrase is not reduced to generic release.

Do not use the plural noun alone to define every sin category or to detach forgiveness from Jesus' blood in the verse.