Psalm 52
Given Peter’s focus on the certainty of the day of judgment it would be good to sing a psalm that also focuses on the same theme. Psalm 52:1–9 is one example, affirming that the Lord will judge those who do evil whereas the godly will be kept for salvation. This will be a good song to sing either before or after your sermon.
1 This is now the second letter that I am writing to you, beloved. In both of them I am stirring up your sincere mind by way of reminder,