Mark 3:29

29Whoeverὃςhoweverδ’ἂνshall blasphemeβλασφημήσῃagainstεἰςtheτὸSpiritπνεῦματὸHolyἅγιον,notοὐκhasἔχειforgivenessἄφεσινtoεἰςtheτὸνageαἰῶνα,butἀλλὰguiltyἔνοχόςisἐστιν[of] eternalαἰωνίουsinἁμαρτήματος.

But whoever may blaspheme in regard to the Holy Spirit does not have forgiveness to the age, but is guilty [of] eternal sin.”