Is Malachi the last book written?

While Malachi is often placed at the end of the Old Testament, it's not definitively the last book written.

Here's why:

* Biblical Canon: The order of the Old Testament books was established centuries after their original writing.

* Dating is Uncertain: The exact dating of most Old Testament books is debated by scholars, including Malachi. Some place it around the 5th century BCE, while others suggest later.

* Other Late Books: There are other books potentially written later than Malachi, such as Daniel, Esther, and possibly parts of Chronicles.

In conclusion, while it's possible Malachi was one of the last Old Testament books written, it's not confirmed as the absolute final one. The exact order remains a matter of scholarly discussion.