JW this is what Jesus said
Then he took a cup, gave thanks, and gave it to them, saying, "Drink from it, all of you,
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for this is my blood of the covenant, which will be shed on behalf of many for the forgiveness of sins.
This is what Scripture says about those who refused to believe that.

Heb 10:
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Do you not think that a much worse punishment is due the one who has contempt for the Son of God, considers ordinary the covenant-blood by which he was consecrated, and insults the spirit of grace?