The Book of 1 Chronicles is a combination of narrative history and genealogy. Ezra is traditionally considered as the author of this book, which is likely to have been written between 450 and 425 BC. It bears some resemblance to 1 & 2 Samuel and 1 & 2 Kings. The Book of 1 Chronicles was written after the exile, and the purpose of this book is to help and encourage people returning to Israel in understanding how to worship God.
