1 Chronicles 2:6 lists the five sons of Zerah: Zimri, Ethan, Heman, Calcol, and Dara. This verse is part of a genealogy, simply recording the descendants of Zerah for the historical record.
The book of 1 Chronicles was written to document the family lines of Israel, especially the tribe of Judah. In this verse, the chronicler is listing out the sons of Zerah, who was a son of Judah. These names help trace the lineage and connections among the tribes and families in Israel’s early history.