Beware of Dogs. Philippians 3:1-3.

Finally, my brethren, rejoice in the Lord. For me to write the same things to you is not tedious, but for you it is safe. Beware of dogs, beware of evil workers, beware of the mutilation! For we are the circumcision, who worship God in the Spirit, rejoice in Christ Jesus, and have no confidence in the flesh, (Philippians 3:1-3)