He who says he is in the light and hates his brother, is in the darkness even until now.
"Fellowship" (Gr. koinonia) is the less common term occurring only four times in 1 John: 1 John 1:3 (twice), 6, 7. "Know" is more common. Ginosko (to know experientially) appears 24 times: 1 John 2:3-5; 1 John 2:13 (twice), 14, 18, 29; 1 John 3:1 (twice), 6, 16, 19, 20, 24; 1 John 4:2; 1 John 4:6 (twice), 7, 8, 13, 16; 1 John 5:2; 1 John 5:20. Oida (intellectual knowledge) appears 15 times: 1 John 2:11; 1 John 2:20-21 (twice), 29; 1 John 3:2; 1 John 3:5; 1 John 3:14-15; 1 John 5:13; 1 John 5:15 (twice), 18, 19, 20. The noun ginosis (experiential knowledge) is absent from this epistle.