1 John 5:16 If you see a Christian brother or sister sinning in a way that does not lead to death, you should pray, and God will give that person life. But there is a sin that leads to death, and I am not saying you should pray for those who commit it. What is this sin that leads to death? We will all die of something, and sin is a common reason why we die in general. Just like smoking. If a person smokes most of their life and decides actually to quit, they may still die of the consequences of the sin, like lung cancer. Is this a sin that leads to death? Or is it talking about something completely different here?