Genesis 4:9
"And the LORD said unto Cain, Where is Abel thy brother? And he said, I know not: Am I my brother’s keeper?"
Cross References (ranked by relevance)
He that covereth his sins shall not prosper: but whoso confesseth and forsaketh them shall have mercy.
Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
When he maketh inquisition for blood, he remembereth them: he forgetteth not the cry of the humble.
And they sent the coat of many colours, and they brought it to their father; and said, This have we found: know now whether it be thy son’s coat or no.