GOD'S WORD® Translation
The LORD asked Cain, "Where is your brother Abel?" "I don't know," he answered. "Am I supposed to take care of my brother?"

American Standard Version
And Jehovah said unto Cain, Where is Abel thy brother? And he said, I know not: am I my brother's keeper?

Berean Study Bible
And the LORD said to Cain, “Where is your brother Abel?” “I do not know!” he answered. “Am I my brother’s keeper?”

Douay-Rheims Bible
And the Lord said to Cain: Where is thy brother Abel? And he answered, I know not: am I my brother's keeper?

English Revised Version
And the LORD said unto Cain, Where is Abel thy brother? And he said, I know not: am I my brother's keeper?

King James Bible
And the LORD said unto Cain, Where is Abel thy brother? And he said, I know not: Am I my brother's keeper?

World English Bible
Yahweh said to Cain, "Where is Abel, your brother?" He said, "I don't know. Am I my brother's keeper?"

Young's Literal Translation
And Jehovah saith unto Cain, 'Where is Abel thy brother?' and he saith, 'I have not known; my brother's keeper -- I?'

Genesis 4:9 Additional Translations ...