What does the Bible say about having a clean heart?

The Bible illustrates that a clean heart is essential for fellowship with God. In Psalm 51:10, David pleads for God to create a clean heart within him. This clean heart is not achieved by human effort but is granted by God's grace through faith in Jesus Christ. In Ezekiel 36:26, God promises to give His people a new heart and a new spirit. This transformation enables believers to rely on Christ as their righteousness and cleanse from sin, affirming that true cleansing and justification come solely through faith in Him.