What does the Bible say about the concept of original sin?

The Bible makes it clear that original sin affects all humanity due to the sin of Adam. Romans 3:9-10 states, 'What then? Are we better than they? No, in no wise; for we have before proved both Jews and Gentiles, that they are all under sin. As it is written, there is none righteous, no, not one.' This indicates that every descendant of Adam inherits sinfulness, demonstrating that no one is righteous before God. Moreover, Romans 5:12 expounds that 'as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned.' This reinforces the concept that we are guilty because we actually sinned in Adam, making original sin a fundamental aspect of human nature.