Mark 3:22-30

22 The scribes who came down from Jerusalem said, "He has Beelzebul," and, "By the prince of the demons he casts out the demons."

23 He summoned them, and said to them in parables, “How can Satan cast out Satan?  24 If a kingdom is divided against itself, that kingdom cannot stand.  25 If a house is divided against itself, that house cannot stand.  26 If Satan has risen up against himself, and is divided, he can't stand, but has an end.  27 But no one can enter into the house of the strong man to plunder, unless he first binds the strong man; and then he will plunder his house.  28 Most assuredly I tell you, all of the children of men's sins will be forgiven them, including their blasphemies with which they may blaspheme;  29 but whoever may blaspheme against the Holy Spirit never has forgiveness, but is guilty of an eternal sin”  30 -- because they said, "He has an unclean spirit."

Matthew 12:32

32 Whoever speaks a word against the Son of Man, it will be forgiven him; but whoever speaks against the Holy Spirit, it will not be forgiven him, neither in this world, nor in that which is to come.

Luke 12:10

10 Everyone who speaks a word against the Son of Man will be forgiven, but those who blaspheme against the Holy Spirit will not be forgiven.