Luke 12:8
And everyone who speaks a word against the Son of Man will be forgiven, but anyone who blasphemes against the Holy Spirit will not be forgiven — the distinction allows for the disciples' failure under pressure (speaking against the Son of Man out of fear) to be forgivable while establishing an absolute limit at the sustained, willful rejection of the Spirit's testimony. The unforgivable sin is not a single utterance but a settled disposition of resistance.