If you're going to preach against sin you should also preach against the law.

Sin kills (Romans 7:11)
The letter of the law kills (2 Corinthians 3:6).

The wages of sin is death (Romans 6:23).
The ministry of laws engraved in letters on stone brought death (2 Corinthians 3:7).

Sin gives birth to death (James 1:15).
The law arouses sinful passions & bears fruit for death (Romans 7:5).

You have died to sin (Romans 6:2).
You died to the law (Galatians 2:19). You have died to the law through the body of Christ (Romans 7:4).

Because Jesus bore our sins in His body on the cross we have died to sins & live for righteousness (1 Peter 2:24).
We have been released from the Law, having died to the law which bound us in chains (Romans 7:6).

Consider yourself just as dead to sin as Jesus is (Romans 6:10-11).
If you are led by the Spirit, you are not under the law. If you are led by the law you are not being led by the Spirit (Galatians 5:18).
When you are not under law sin stops being your master because you are instead under grace (Romans 6:14).

Jesus made us alive together with Him while we were dead in our sins and transgressions. He has taken away from us all of our sins and transgressions. He canceled out the certificate of debt which consisted of laws that were against us & hostile to us. He has taken the law out of the way, having nailed it to the cross (Colossians 2:13-14).

The law was not made for the righteous, know that everyone who has trusted Jesus is righteous. The Law is only good if one uses it lawfully, according to the glorious gospel of the blessed God. Do not use the law for anything other than revealing the glorious gospel of the blessed God to the unrighteous so that they may trust Jesus (1 Timothy 1:8-11).