They say they know God, but the evil things they do show that they don’t accept him. They are disgusting. They refuse to obey God and are not capable of doing anything good.
If we say we love God but hate any of our brothers or sisters in his family, we are liars. If we don’t love someone we have seen, how can we love God? We have never even seen him.
Your father is the devil. You belong to him. You want to do what he wants. He was a murderer from the beginning. He was always against the truth. There is no truth in him. He is like the lies he tells. Yes, the devil is a liar. He is the father of lies.
This is important, because there are many people who refuse to obey—people who talk about worthless things and mislead others. I am talking especially about those who say that men who are not Jews must be circumcised to please God.