Jesus said
Matthew 12:31
"And so I tell you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven."
Revelation 14:9-10
"A third angel followed them and said in a loud voice: "If anyone worships the beast and his image and receives his mark on the forehead or on the hand, he, too, will drink of the wine of God's fury, which has been poured full strength into the cup of his wrath. He will be tormented with burning sulfur in the presence of the holy angels and of the Lamb."