1 John 4:2

4:2 By this you know the Spirit of God: Every spirit that confesses Jesus as the Christ who has come in the flesh is from God,

1 John 4:12

4:12 No one has seen God at any time. If we love one another, God resides in us, and his love is perfected in us.

1 John 5:2

5:2 By this we know that we love the children of God: whenever we love God and obey his commandments.