Who wrote Genesis? The book itself never says. Jewish and Christian tradition has long credited Moses with writing the whole first five books, Genesis through Deuteronomy, and modern scholars who study the text closely see signs of several older sources woven together over a long stretch of time. Both are worth knowing, and neither one changes what the book has meant to readers for thousands of years.
Genesis doesn’t name its author
There is no line anywhere in Genesis that says who wrote it. Unlike a prophetic book that opens by naming a prophet, Genesis simply begins with “In the beginning” and moves straight into the story. The same is true of Exodus, Leviticus, Numbers, and Deuteronomy. None of the five books that make up the Pentateuch, or Torah, carries a signature.
Where the Moses tradition comes from
The idea that Moses wrote these five books goes back well over two thousand years and is not a guess pulled from nowhere. Exodus and Deuteronomy both describe Moses writing things down himself: laws, a song, a record of Israel’s time in the wilderness. Later books in the Old Testament refer back to “the Book of the Law of Moses” when citing material from these five books, treating Mosaic authorship as settled. By the time of the New Testament, this was the standard assumption. Jesus and the apostles refer to the first five books simply as “Moses.” That is a long, consistent line of testimony, and it is why “the five books of Moses” became the standard name for this section of Scripture in both Jewish and Christian tradition. We cover the wider pattern of named and unnamed authors across the whole Bible in who wrote the Bible.
What modern scholars see in the text
Since the 1800s, scholars reading Genesis closely have noticed things that don’t fit smoothly with one person writing straight through: two different names for God used in different passages, a few events told twice with details that don’t quite line up, and shifts in vocabulary from one section to the next. The most common explanation for this, usually called the documentary hypothesis, says the five books were built from several older written sources that were later combined by editors into the text we now have. Not every scholar accepts every part of that theory, and it has been revised many times since it was first proposed. A good number of scholars, including many who hold a traditional view of Scripture, argue that Genesis has a core that does go back to Moses or his era, with later scribes updating place names, adding explanatory notes, and smoothing the text for readers who came after him. Both sides are reading the same words. They draw different conclusions from the patterns they find.
When Genesis took the shape we have now
This is where honesty requires a range rather than a date. If a substantially Mosaic core is right, that material would reach back to the second millennium BC, the era generally associated with Moses and the exodus. Scholars who see a longer process of editing usually place the final shaping later, with many pointing to the Babylonian exile in the 500s BC or the century or two after, when priests and scribes in Jerusalem were gathering Israel’s history into something like its current form. What both pictures agree on is that the material inside Genesis, names, places, family lines, ancient customs, is old, likely older than the point when the book reached the form we read today. For how this fits into the larger timeline of Scripture, see when the Bible was written.
Why this matters less than you think
None of this is a new threat to the book. Jewish and Christian communities have argued about who wrote Genesis for centuries while still reading it, teaching from it, and treating it as Scripture. Its standing in either tradition was never based on having one verified name attached to the last page. What gave Genesis its place was the story itself: a world made and then broken, a family carried through famine into Egypt, and the conviction that the God described in these pages was actually at work in real events. You do not need to settle the authorship question before you can trust what the book says about who God is and what he has done. You just need to read it. If that’s where you’re at, here is where to start reading the Bible.