Mark 3:28-29
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The context
Mark 3 places this saying at the end of the Beelzebul controversy. Jesus's family has come to restrain him, and scribes from Jerusalem have said he casts out demons by the ruler of demons. The saying about forgiveness is his answer to that specific charge, and it is followed immediately by the arrival of his mother and brothers.
What it establishes
It establishes that Jesus drew a line between ordinary speech against himself and a specific attribution of his work to an unclean spirit. The first is placed inside a blanket amnesty; the second is placed outside it.
What it does not establish
It does not define the sin's psychology. Mark ties the saying to that accusation in that setting, and does not describe a repeatable test a person could apply to themselves. Whether the sin can be committed today, and by whom, is a later question the verse does not answer.
Short note, first pass, October 2026. Corrections welcome.
Cited in these answers
Part of Scripture, Opened — the exegetical layer behind every citation on this site. Scripture quotations are from the ESV.