Brother: Signifies: Mankind
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Genesis 9:5
And surely I will require the life of any man or beast by whose hand your lifeblood is shed. I will demand an accounting from anyone who takes the life of his fellow man:
Matthew 18:35
That is how My heavenly Father will treat each of you unless you forgive your brother from your heart.”
1 John 3:15
Everyone who hates his brother is a murderer, and you know that eternal life does not reside in a murderer.