“He that saith he is in the light, and hateth his brother, is in darkness even until now.”
King James Version (KJV)
2:9 He that saith he is in the light - In Christ, united to him. And hateth his brother - The very name shows the love due to him. Is in darkness until now - Void of Christ, and of all true light.
1Jo 2:9 He that saith he is the light, etc. If one hates his brother he demonstrates that he is in darkness.