26 What have you done? Again the Lord’s question is rhetorical (see Gen 3:13), condemning Cain for his sin.
27 The word “voice” is a personification; the evidence of Abel’s shed blood condemns Cain, just as a human eyewitness would testify in court. For helpful insights, see G. von Rad, Biblical Interpretations in Preaching; and L. Morris, “The Biblical Use of the Term ‘Blood,’ ” 6 (1955/56): 77–82.

In other versions

And the Lord said, “What have you done? The voice of your brother’s blood is crying to me from the ground.

The Lord said, “What have you done? Listen! Your brother’s blood cries out to me from the ground.

Then he said, “What have you done? Your brother’s blood cries out to me from the ground!

But the Lord said, “What have you done? Listen! Your brother’s blood cries out to me from the ground!

And he said, “What have you done? The voice of your brother’s blood is crying out to me from the ground.

And he said, What hast thou done? the voice of thy brother’s blood crieth unto me from the ground.

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