Why Deuteronomy Might Be the Most Important Book You've Never Really Read

Most people skip Deuteronomy.

I get it. It's the fifth book of the Bible, it sits at the end of the Law, and most of us associate it with long lists of rules and ceremonial codes we don't fully understand. When people dive into the Old Testament, they often slow down somewhere in Leviticus, take a detour through Numbers, and never quite make it to what Moses actually said before he died.

That's a shame — because Deuteronomy might be the most important book in the entire Old Testament.

Moses' Final Words

Here's the setup: Israel is standing on the plains of Moab. Forty years of wilderness wandering are finally over. The Promised Land is visible just across the Jordan River. And Moses — the man who led them through it all — knows he won't be crossing with them.

So he preaches.

For forty chapters, Moses rehearses everything God has done, everything God has said, and everything God is calling His people to as they enter a new season. He warns them. He encourages them. He sings to them. He blesses them tribe by tribe. And then he dies on a mountain, looking out over the land he spent his life leading people toward.

These are not routine words. These are the final words of a man who has walked with God for eighty years, who has seen the plagues, the sea split, the bread fall from heaven, and the glory of God pass by in a cleft of rock. Every sentence carries the weight of a lifetime.

The Most Quoted Old Testament Book

Here's something most people don't know: Jesus quoted Deuteronomy more than any other Old Testament book.

When Satan tempted Him in the wilderness for forty days — a deliberate echo of Israel's forty years — Jesus answered every temptation with a verse from Deuteronomy. "Man shall not live by bread alone." "You shall not put the Lord your God to the test." "You shall worship the Lord your God and Him only shall you serve."

Jesus knew Deuteronomy. He lived it. He embodied it. And when the pressure was at its highest, it was Moses' words that came out of His mouth.

That alone should make us want to know this book.

The Shema: The Heartbeat of Scripture

At the center of Deuteronomy is one of the most important statements in all of Scripture:

"Hear, O Israel: The Lord our God, the Lord is one. Love the Lord your God with all your heart and with all your soul and with all your strength." — Deuteronomy 6:4–5

The Jewish people called this the Shema — from the Hebrew word for "hear." They prayed it twice a day. They wrote it on their doorposts. They bound it to their hands and foreheads as a physical reminder that love for God was not a Sunday morning feeling but a total-life orientation.

When a religious expert asked Jesus what the greatest commandment was, He quoted this verse. Not a New Testament verse. Not something new. Something Moses said — because the call to love God with everything you have is not a new covenant invention. It has always been the heart of what God wants from His people.

A New Book: Under Covenant

I've just finished a verse-by-verse devotional through Deuteronomy called Under Covenant: The Call to Love and Obey the Lord, and I couldn't be more excited to share it.

This book walks through every chapter of Deuteronomy with pastoral warmth, practical application, and a constant eye toward how these ancient words speak to us today. We'll explore:

• What the covenant God made with Israel reveals about His character

• How the blessings and curses of Deuteronomy point forward to Christ

• Why Moses' warnings about prosperity and forgetfulness are just as urgent now

• What it looks like to live as people who are truly "under covenant" with a holy and faithful God

Whether you're new to the Old Testament or have read it for years, my prayer is that Under Covenant gives you fresh eyes for this extraordinary book — and a deeper love for the God who wrote it.

Order "Under Covenant: Deuteronomy — The Call to Love and Obey the Lord: A Devotional Journey Through Moses' Final Words on Faith, Obedience, and God's Faithfulness" here.