Genesis 4:9-10

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9} Then the Lord said to Cain, “^(A)Where is Abel your brother?” And he said, “I do not know. Am I my brother’s keeper?” ^{Tools
10} He said, “What have you done? ^(B)The voice of your brother’s blood is crying to Me from the ground.

Cross references:

A. Genesis 4:9: Genesis 3:9

B. Genesis 4:10: Numbers 35:33; Deuteronomy 21:1-9; Hebrews 12:24; Revelation 6:9; Revelation 6:10