Read 1 John 3:15 Using Other Translations
Whosoever hateth his brother is a murderer: and ye know that no murderer hath eternal life abiding in him.
Everyone who hates his brother is a murderer, and you know that no murderer has eternal life abiding in him.
Anyone who hates another brother or sister is really a murderer at heart. And you know that murderers don’t have eternal life within them.