What does the Bible say about the price of a man's soul?

According to Proverbs 20:14, the price for a man's salvation is not negotiable; it is perfect obedience to God's law, which includes maintaining an immaculate standing before Him in thought, word, and deed. As expressed in Leviticus 18:5 and Psalm 24:3-5, only those with clean hands and pure hearts can stand before God. This underscores humanity's inability to meet such a high standard due to inherent sinfulness, as no one is free from guilt or defilement. Thus, the price of a man's soul demands human perfection, which none can achieve without the transformative grace of God.