1 John 2:2-5

He himself is the sacrifice that atones for our sins—and not only our sins but the sins of all the world. And we can be sure that we know him if we obey his commandments. If someone claims, “I know God,” but doesn’t obey God’s commandments, that person is a liar and is not living in the truth. But those who obey God’s word truly show how completely they love him. That is how we know we are living in him.