I apologize if this has already been covered
Before we begin, I understand that all sins ultimately leads to death but hear me out
In IJohn 5:16 they talk about deadly sins
"If anyone sees his brother commit a sin that does not lead to death, he should pray and God will give him 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 he should pray about that"
It's explicitly said that there are sins that leads to death and others not, what's the difference ? You can pray for your fellow's non deadly sins and he will receive life aka forgiveness but you can't get forgiveness for someone if it's a deadly sin ie they need to repent themselves.
This is where it gets interesting (at least for me), what are those deadly sins ? popular opinion would suggest its the so called 7 sins in proverb 6:16-19 . Others think of the 7 deadly sins made by the Catholic church but I beg to differ from all of these.
There are indeed 7 deadly sins and they are quite easy to find, I asked myself this question "if they are sins deserving of death, what would a christian of that time refer to ? surely it's the 10 commandment, then what in the 10 commandment were punishable by death ? ". Then it strikes me, I noticed that only the commandment from 1st to 7th were directly punishable by death if found guilty.
So there you have it, the 7 deadly sins, someone breaking these commandment must repent by themselves if they want to be saved.
The best thing is, you can't find a loophole because being dishonest about your repentance is a deadly sin as it breaks the 3rd commandment.
I find it amazing that the 1st to 7th commandment are pertaining to the creation themselves (sovereignty of God, Sabbath, Parent, value of Life and marriage) so breaking them is like a direct confrontation to God more than to a human which is why they are deadly unlike the last 3 commandment which are more related to earthly relationship.
Lastly, it's fascinating how the last commandment (coveting) is the place where every sin began.
Thank you for reading