The Old Testament was primarily written in Hebrew, with some parts in Aramaic. This is because Hebrew was the main language of the ancient Israelites. As we delve deeper into the history of the Bible, we'll discover that it's a rich tapestry of languages and cultures.
Now, you might be wondering, what about the New Testament? Well, it was written in Koine Greek, which was the common language of the Mediterranean world at that time. This is why the New Testament is filled with Greek words and phrases that have become an integral part of the Christian tradition.