Acts 11:1–18 (ESV)

1 Now the apostles and the brothers who were throughout Judea heard that the Gentiles also had received the word of God.

Psalm 117 calls on the nations to worship the Lord and praise him. This would be a good song to sing either before or after your sermon.

o   Seedbed Psalter

o   Reformed Churches in New Zealand (lyrics and sheet music) (audio)