Genesis 4:9

4:9 Then the Lord said to Cain, “Where is your brother Abel?” ¹  And he replied, “I don’t know! Am I my brother’s guardian?” ² 

¹ sn Where is Abel your brother? Again the Lord confronts a guilty sinner with a rhetorical question (see Gen 3:9-13), asking for an explanation of what has happened.

² tn Heb “The one guarding my brother [am] I?”