Genesis 4:8

8 Now Cain said to his brother Abel, “Let’s go out to the field.”a While they were in the field, Cain attacked his brother Abel and killed him.

Read Genesis 4:8 Using Other Translations

And Cain talked with Abel his brother: and it came to pass, when they were in the field, that Cain rose up against Abel his brother, and slew him.
Cain spoke to Abel his brother. And when they were in the field, Cain rose up against his brother Abel and killed him.
One day Cain suggested to his brother, “Let’s go out into the fields.” And while they were in the field, Cain attacked his brother, Abel, and killed him.