The purpose of this post is to provide a biblical definition of sin. I believe this is important because mainstream Christianity focuses on grace, believing they can ignore the Old Testament, sin, hell-fire preaching…. If you have read through the Bible, then you know that they are making up their way as they go along. They are on the wide road that leads to destruction, according to Jesus in Matthew 7. When Jesus opened His ministry in Matthew 4, His first words were, Repent and believe the gospel. To repent of known sin, one must know how to define it first of all….