How do we know original sin is true according to the Bible?

The concept of original sin is supported by Scripture, particularly in Romans 5:12, which asserts that sin entered the world through one man, Adam, and death followed as a consequence. This passage explains that all mankind fell in Adam and thus inherited a corrupt nature and guilt due to his original disobedience. The imputation of Adam's sin to his descendants illustrates that all are born sinful, incapable of righteousness on their own. This doctrine emphasizes the need for divine grace and redemption, which is fully realized in Christ, the last Adam.