And in the synagogue there was a man who had the spirit of an unclean demon, and he cried out with a loud voice, “Ha! What have you to do with us, Jesus of Nazareth? Have you come to destroy us? I know who you are—the Holy One of God.” But Jesus rebuked him, saying, “Be silent and come out of him!” And when the demon had thrown him down in their midst, he came out of him, having done him no harm.
In the synagogue there was a man with an unclean spirit who called out to Jesus, and Jesus rebuked.
Just because we are in a church service, it does not mean the enemy will not enter and attempt to disrupt the ongoing worship of God and the teaching from the Word of God.
As Spirit filled Christ followers, we need to always be prepared for such encounters, discerning what is happening around us, being aware of what is being said and done, knowing when and how to act if something is not Christ honouring.