1 John 2:19; 1 John 4:20; 1 John 5:3

1 John 2:19

19 They went out from us, but they were not of us; for if they had been of us, they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us.

1 John 4:20

20 If a man say, I love God, and hateth his brother, he is a liar: for he that loveth not his brother whom he hath seen, how can he love God whom he hath not seen?

1 John 5:3

3 For this is the love of God, that we keep his commandments: and his commandments are not grievous.