Sanctified and sanctification

1 Corinthians 6:

11 Such were some of you. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God.

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you were sanctified,
ἡγιάσθητε (hēgiasthēte)
Verb - Aorist Indicative Passive - 2nd Person Plural
Strong's 37: From hagios; to make holy, i.e. purify or consecrate; to venerate.
Strong's Greek: 37. ἁγιάζω (hagiazó) — 28 Occurrences

That was a punctiliar event that happened once in the past when we first believed. However, G37 was polysemantic. BDAG:
① set aside someth. or make it suitable for ritual purposes, consecrate, dedicate of things
② include a pers. in the inner circle of what is holy, in both cultic and moral associations of the word, consecrate, dedicate, sanctify
③ to treat as holy, reverence of pers.
④ to eliminate that which is incompatible with holiness, purify

Meaning #4 was not necessarily punctiliar.

1Th 4:

3 For this is the will of God, your sanctification: that you abstain from sexual immorality;

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Paul suggested sanctification was a lifetime pursuit, not a singular event.

ἁγιασμὸς (hagiasmos)
Noun - Nominative Masculine Singular
Strong's 38: From hagiazo; properly, purification, i.e. purity; concretely a purifier.
Strong's Greek: 38. ἁγιασμός (hagiasmos) — 10 Occurrences

BDAG:

personal dedication to the interests of the deity, holiness, consecration, sanctification; the use in a moral sense for a process or, more often, its result (the state of being made holy)

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Believers went through a process of sanctification of abstaining from sexual immorality.

4 that each one of you know how to control his own body in holiness and honor.

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holiness
ἁγιασμῷ (hagiasmō)
Noun - Dative Masculine Singular
Strong's 38: From hagiazo; properly, purification, i.e. purity; concretely a purifier.

Now, Paul used G38 not as a (nominative) process but as a (dative) state of being.

When we first believed, the Spirit (Paraclete) sanctified or separated us from unbelievers in a one-time event. After that, we undergo a process of sanctification to avoid sinful behaviors and reach a state of holiness.

See also

• Repentance: Initial and Subsequent