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 4:20

4:20 If anyone says “I love God” and yet hates his fellow Christian, he is a liar, because the one who does not love his fellow Christian whom he has seen cannot love God whom he has not seen.