It came about at that time that Judah

This introduces a new part of the story that focuses on Judah. (See: rc://en/ta/man/jit/writing-newevent)

a certain Adullamite, whose name was Hirah

Hirah is the name of a man who lived in the village of Adullam. (See: rc://en/ta/man/jit/translate-names)