Isaiah 1:18 offers unlimited forgiveness for scarlet sins — contrasting with the one unforgivable sin of blasphemy against the Spirit.

Mark 3:28-30 is the parallel account of the same teaching, directly echoing Jesus' words on blasphemy against the Holy Spirit.

Luke 12:10 gives the parallel Synoptic version of the unforgivable blasphemy against the Holy Spirit.

1 Timothy 1:13-15 shows Paul's blasphemy was forgiven due to ignorance — contrasting with the willful, knowing rejection that makes the blasphemy against the Spirit unforgivable.

Hebrews 6:4 describes those who fall away after enlightenment as impossible to restore — paralleling the state of the one who blasphemes the Holy Spirit.

Hebrews 10:26 warns that willful sin after receiving truth leaves no sacrifice — directly parallel to the unforgivable blasphemy against the Holy Spirit.

Hebrews 10:29 describes insulting the Spirit of grace — a deliberate rejection echoing the blasphemy against the Holy Spirit.

In Ezekiel 33:11, God desires repentance from the wicked — contrasting with the blasphemy against the Spirit, which represents a hardened, final refusal.

Luke 22:65 records people blaspheming Jesus, an example of the forgivable blasphemy against the Son of Man.

John 8:48 shows accusations that Jesus has a demon, illustrating the forgivable blasphemy against the Son.

1 John 1:9 promises forgiveness upon confession — contrasting with the blasphemy against the Spirit, which precludes repentance and confession.

1 John 2:1 offers Jesus as an advocate for sin — contrasting with the blasphemy against the Spirit, where no advocate avails.

1 John 2:2 says Christ's atonement is for the whole world — contrasting with the specific sin of blasphemy against the Spirit that remains unforgiven.

1 John 5:16 distinguishes a sin that leads to death, echoing Jesus' concept of an unforgivable sin.