Anyone who blasphemes the Name of the Lord must be stoned to death by the whole community of Israel. Any native-born Israelite or foreigner among you who blasphemes the Name of the Lord must be put to death.
If you see a fellow believer 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.