An excerpt from "Got Questions.org" entitled, "What is the meaning of Impurity in the Bible?" states: "The Bible teaches that impurity is the default state for human beings, post-fall. We are all born as unclean sinners (Psalm 51:5; Romans 3:23), and we must be cleansed if we are to see God. No one but God is perfect; all of us have been polluted through the impurity of sin. The slightest sin is still a lethal contaminant in our souls, and this is bad news for us: “Of this you can be sure: No immoral, impure or greedy person . . . has any inheritance in the kingdom of Christ and of God” (Ephesians 5:5; cf. Revelation 21:27). Like lepers, we are all in desperate need of God’s mercy and grace to reach out and cleanse us from the impurities that defile us. We need Jesus’ touch and the gift of His righteousness (1 Corinthians 1:30). “Blessed is the one whose sin the LORD does not count against them” (Psalm 32:2).
The glory of the gospel is that God can make what is impure, pure; and what is unclean, clean. To our eternal joy, God desires to do just that, for Christ’s sake: “If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness” (1 John 1:9)." This article may be viewed at: What is the meaning of Impurity in the Bible?/gotquestions.org
Reference: Ephesians 4:19