Matthew 12:31-32 (Larger context: 12:22-37)
31 "Therefore I say to you, any sin and blasphemy shall be forgiven men, but blasphemy against the Spirit shall not be forgiven.
32 "And whoever shall speak a word against the Son of Man, it shall be forgiven him; but whoever shall speak against the Holy Spirit, it shall not be forgiven him, either in this age, or in the {age} to come.
Mark 3:28-30 (Larger context: 3:20-30)
28 "Truly I say to you, all sins shall be forgiven the sons of men, and whatever blasphemies they utter;
29 but whoever blasphemes against the Holy Spirit never has forgiveness, but is guilty of an eternal sin"--
30 because they were saying, "He has an unclean spirit."
Luke 12:10
10 "And everyone who will speak a word against the Son of Man, it shall be forgiven him; but he who blasphemes against the Holy Spirit, it shall not be forgiven him.