What is “sin that leads to death” in 1 John 5:16?

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1 John 5:16 (NIV) _{Emphasis Added}
If you see any brother or sister commit a sin that does not lead to death, you should pray and God will give them life. I refer to those whose sin does not lead to death. There is a sin that leads to death. I am not saying that you should pray about that.

In that passage, it says that “there is a sin that leads to death.” What sin is this text referring to? Is it referring to a specific sin?

Also, is it “a sin” as in “a specific sin that leads to death” or is this a more generic concept of “sin” as in “there is a type/category of sin that leads to death”?