Hebrews 10:28-29

28In the old agreement, anyone who refused to obey Moses' rules had to die. If two or three people said that he had done a bad thing, that person had to die. They would not forgive him.

29So think about a person who has turned against the Son of God. That person's punishment will surely be much worse! He says that Christ's sacrifice has no value for him. He has made God's new agreement seem like something bad. It was Christ's death on the cross that made that person clean, so that he belonged to God. But now that person has insulted God's Spirit, who brings God's kind help to us.