9Anyone who claims to be in the light but hates a brother or sister The Greek word for brother or sister (adelphos) refers here to a believer, whether man or woman, as part of God’s family; also in verse 11; and in 3:15, 17; 4:20; 5:16. is still in the darkness. 10Anyone who loves their brother and sister The Greek word for brother and sister (adelphos) refers here to a believer, whether man or woman, as part of God’s family; also in 3:10; 4:20, 21. lives in the light, and there is nothing in them to make them stumble.