I'm gonna make a long post trying to prove particular redemption or better known as limited atonement.
One bit of scripture that first caught my eye during my early days as a reformed christian was Luke 15:4:
What man of you, having a hundred sheep, if he has lost one of them, does not leave the ninety-nine in the open country, and go after the one that is lost, until he finds it?
It basically a metaphor of how God will never fail to save all of his sheep. But who are his sheep? We see in Matthew 25:33-34 those who are his sheep will inherit the kingdom of God. They are the ones who are blessed and are prepared since the foundation of the world!
Now one thing we must understand about sheeps is that sheeps cannot choose their owners. Sheeps simply exist and follow commands of their shepherds. A sheep does not have the freedom or even the mental capacity to choose or deny his master or even to obey or disobey his shepherd. Now what does this say about the sheep of christs?
We see in John 10:15 christ lays down his life for his sheep. Now if you come with the wrong presupposition then that can badly affect your reading of the text. A lot of people who "assume" that christ died for everyone in the world by misinterpreting key pieces of scripture. But read what the bible says. "he lays down his life for his sheep."
But who are the sheep? If the sheep is everyone in the world then that would mean that everyone is going to heaven because christ wouldn't even let one of his sheeps get away as previously stated from Luke 15:4. Also, realise how it is the shepherd that goes after the sheep, not the sheep seeing and finding the shepherd since sheeps are not made with this ability. This perfectly line with what pauls says in romans:
As it is written: “There is no one righteous, not even one; There is no one who understands; no one who seeks God. All have turned away; they have together become worthless; there is no one who does good, not even one.
Romans 3:10-12
Now, here are a couple verses I really want you guys to think about:
John 10:24-28
Could the Jews truly say Christ died for their sins? Could they really believe that they had hope of salvation of they were not even of a part of Christ's flock? Clearly salvation is not meant for all.
So who are the reprobate? They are the goats of Matthew 25:31-46, they are the pigs mentioned in Luke 15:11-32 and they are the ones who God hates before they were even conceived as stated in Romans 9:11-13