A ball of new sourdough dough risen over 48 hours

What Is A New Lump? – A Demonstration

Builds on Does Leaven Really Mean Sin? — what leaven stands for.

Mix flour and water into a stiff lump, add nothing else — no yeast, no starter — cover it, and set it on the counter. For a day it does almost nothing. By the second day it has swelled, shot through with bubbles, giving off a faint sour smell. You added no leaven. It leavened itself. Hold onto that, because it answers a question Paul asks that rarely gets read slowly enough:

Cleanse out the old leaven that you may be a new lump, as you really are unleavened. For Christ, our Passover lamb, has been sacrificed. — 1 Corinthians 5:7 (ESV)

He does not say cleanse out leaven. He says the old leaven. And he says become a new lump. What is a new lump?

God has a habit of teaching through the thing itself rather than around it — the tabernacle built to a pattern shown on the mountain (Exodus 25:40), the whole ceremonial system “a copy and shadow” of something real (Hebrews 8:5), the invisible made plain through what has been made (Romans 1:20). The parables work this way; even the miracles are parables in action, acted out. Leaven is one of these physical things. So to read Paul, the move is not to think harder about the word. It is to make bread. (See The Same Shape at Every Scale)

Years ago I lived a few streets from a bread factory. The whole neighborhood smelled of it — you couldn’t step outside without picturing warm, buttered bread. But a factory loaf is a modern thing, mixed and proofed and turned out by the thousands.

When the Bible says leaven, it means sourdough — not a packet of yeast from the store, which the ancient world did not have. Every household kept a “mother” lump of dough that carried the yeast. To bake, you tore off a piece, kneaded it into fresh flour and water, and let it work; then you fed the mother with more flour and water to keep it alive. (See What Is Sourdough Bread?)

And where did the yeast come from in the first place? It is already everywhere — in the air, on the grain, in the flour. There is no such thing as a perfectly unleavened kitchen; leaven is in the room with you. Along with the wild yeast come bacteria, and the good ones — strains of lactobacillus — are what give sourdough its tang. That is why a brand-new mother lump can start from nothing but flour and water: the living things are already in it, and the moment there is something to eat, they wake up and begin.

So why ever start a new lump? Sometimes a neighbor’s makes better bread. Sometimes the flour gets contaminated with the wrong food, which feeds the wrong organisms and spoils the whole lump — off smell, off color, no rise. And sometimes the keeper gets lazy or too busy, the lump goes unfed, and it collapses: the yeast and bacteria starve, and the bad ones move in. When that happens, you do not rescue it. You start over.

Flour and water — nothing added.
Flour and water — nothing added.

So I started over — flour and water, no added yeast, pressed into a lump about half the size of my fist and set in a jar under a coffee filter so it could breathe. The first day, almost nothing: a little settling, and right at the peak a few small bubbles of carbon dioxide from microbes that came in on the flour and out of the air here in the Talladega forest.

By forty-eight hours it had grown by more than half, riddled with larger bubbles — and already beginning to sag at the top, because I never fed it. Set the three side by side and the first day looks like nothing, the second like maybe, and the third is unmistakable.

The same dough after 48 hours, risen and airy
48 hours — risen on its own, no yeast added.

Now: is that new lump unleavened, or leavened? It developed yeast — real, active leaven. But it is new yeast. It is not the old leaven. It is leavened, and it is not what came before.

Hold that next to the evening Christ rose. At an inn in Emmaus he sat with two disciples, took bread, blessed and broke it, and their eyes were opened (Luke 24:30-31). This was still the week of Unleavened Bread — and the word for the bread is artos, the everyday word for a loaf, not azymos, the word for unleavened. Luke knew azymos; he uses it elsewhere when he means unleavened. Here, during the very days leavened bread is set aside, he reached for the open word instead. That does not prove the loaf was leavened — artos is general enough to cover bread of any kind. But the writer chose the unmarked word over the precise one he had on hand, which quietly leaves the burden with anyone certain it was unleavened. It is an old question and a contested one — it helped fracture the church once — and it comes into focus in its own place. Here it is enough to notice what the text reaches for, and to let the pattern speak.

Because leaven is not simply the enemy. There is a place where it belongs. The peace offering of thanksgiving was brought with loaves of leavened bread (Leviticus 7:13). And at the close of the Feast of Weeks, the firstfruits presented to God are two loaves “baked with leaven” (Leviticus 23:17) — leavened bread, offered as firstfruits. The Feast of Unleavened Bread and the Feast of Weeks overlap, and the firstfruits at the far end are leavened. By its own contents, another name for the Feast of Weeks is the Feast of Leavened Bread. (See The Feast of LEAVENED Bread)

So the demonstration is doing exactly what the feast does — showing, through the thing itself, a process. The old leaven goes out: not some of it, not the parts we would choose to keep — all of it. Every settled idea about who God is, the whole inherited lump. There is no picking and choosing, because the mind that would do the choosing is the very thing being replaced. That is a death. And it is not one we manage; it is begun in us, not by us. Only then is there a new lump — able to receive the understanding God gives through Christ. A new man, risen.

Leaven is knowledge — teaching, influence, a whole way of seeing — working through the lump it lives in. The question was never whether you are leavened. It is which leaven.

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