Why does the book of Leviticus begin with the burnt offering?

Exodus ends with Moses locked outside the tabernacle because the glory of the LORD filled it — Leviticus opens with a voice from inside that same tent, and its first instruction, the burnt offering, is the beginning of God's answer to how anyone can draw near to him.

Leviticus doesn't start with the burnt offering by accident — it starts there because of exactly how the book right before it ended.

Exodus closes with a problem. The tabernacle is finished precisely as commanded, the cloud covers the tent, and the glory of the LORD fills it so completely that Moses — the man who oversaw the whole construction — cannot go in:

And Moses was not able to enter the tent of meeting, because the cloud had settled on it, and the glory of the LORD filled the tabernacle. — Exodus 40:35

Thirteen chapters of blueprint and building end with the builder locked outside, barred by the very presence the tent was made to hold. That's the question hanging in the air as Leviticus opens: if even the mediator can't enter, how can anyone approach a God like this?

Leviticus 1:1 answers by reaching straight back to that unresolved moment:

And he called to Moses, and the LORD spoke to him from the tent of meeting, saying — — Leviticus 1:1

Notice what's the same and what's changed. It's the same structure — "the tent of meeting," the identical phrase from Exodus 40:35. The glory hasn't gone anywhere. What's changed is the direction of the voice: the LORD now calls to Moses from inside the tent that had just barred him. The glory that shut the door speaks through it.

And what does the voice say first? Not a warning, not a demand — instructions for a sacrifice. Before the sin offering, before the ordination of priests, before the Day of Atonement, God speaks of the burnt offering, the olah — the one sacrifice given back to him whole. This wasn't a new idea. Back in the tabernacle instructions themselves, God had already tied a continual burnt offering to his dwelling among Israel: "there I will meet with you... and I will dwell among the sons of Israel and will be their God" (Exodus 29:42–46). The daily burnt offering at the tent's entrance was bound up, from the start, with the very possibility of God meeting and living among his people.

So the driving question of Leviticus — how can a holy God, now living in the middle of the camp, be approached without consuming the people he lives among? — gets its first answer in the very first chapter, and the answer is a sacrifice wholly given, accepted, and making atonement.

The full study on the burnt offering walks through Leviticus 1 verse by verse, in the Hebrew and Greek text, to see exactly how that answer works.