1 Peter 2:9-12

But you are a chosen race, a royal priesthood, a holy nation, a people for his own possession, that you may proclaim the excellencies of him who called you out of darkness into his marvelous light. Once you were not a people, but now you are God's people; once you had not received mercy, but now you have received mercy.

Beloved, I urge you as sojourners and exiles to abstain from the passions of the flesh, which wage war against your soul. Keep your conduct among the Gentiles honorable, so that when they speak against you as evildoers, they may see your good deeds and glorify God on the day of visitation.

2 Corinthians 7:1

Since we have these promises, beloved, let us cleanse ourselves from every defilement of body and spirit, bringing holiness to completion in the fear of God.

Question: Why must believers keep killing sin, and how do we know the fight ends in life?

Answer: Because we owe the flesh nothing; the Holy Spirit lives in us to put sin to death—and His leading proves we are God’s adopted children, heirs of eternal life.

Romans 8:14
“For all who are led by the Spirit of God are sons of God.”