This week’s verse is 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?
Cain and Abel had offered up the fruit of their labour to God, Cain offered some of the fruit of the land and Abel the first lamb. God was very pleased with Abel’s offering but not with Cain’s. Out of jealousy, Cain murdered his brother. God asked Cain where his brother was, and Cain retorted “Am I my brother’s keeper?” Weirdly, the phrase is still used today for very similar reasons!