by Rabbi Dr. Kari Tuling
There is a small detail that has always bothered me about the Passover story: the timing. Specifically, how is it that the Israelites did not have enough time to allow their dough to rise before they left Egypt? The night before they leave, they are given instructions regarding the pascal lambs, and marking their doorposts with blood—so they do have some time to make preparations for departure. That night, the tenth plague kills the firstborn of those who have not marked the doorposts; come morning, the Egyptians are very ready for them to leave:
The Egyptians urged the people on, impatient to have them leave the country, for they said, “We shall all be dead.” So the people took their dough before it was leavened, their kneading bowls wrapped in their cloaks upon their shoulders.
It makes sense that they did not have time for their bread to rise, because the Egyptians were pressuring them to hurry. But a few verses later, it mentions baking the bread:
The Israelites baked the dough that they had brought out of Egypt into unleavened cakes, since it had not risen. They had been driven out of Egypt and could not delay, and they had not prepared any other provisions.
The text also mentions that they went out among the Egyptians to accept gold and silver as payment for slavery. So now you see my problem: if they had time to ask about gold and silver, and they had time to bake the dough, why didn’t they have time for their bread to rise?
To answer that question, we need to understand how bread was made in the ancient Near East. Leavened bread is made from yeast. But where does the yeast come from? In those days, you couldn’t run to the supermarket for packets of yeast. You would need to leave a pot uncovered and wait for the wind to deposit the yeast, or you would need the yeast to be already present on the fruit itself, as it is with grapes. Yeast requires work.
Rather than leaving your pot of grain and water out every time you needed yeast, you eventually realize that if you keep some of the initial batch—like sourdough starter—you can use it to start up your next batch. And you eventually figure out that you should keep this starter in a specially made bowl, one that allows the yeast to pool at the bottom, so that it stays fresh.
You would learn, from having soaked your grains, that if you let them soak for three days, they will sprout. When they sprout, they have more sugars and vitamins. More to the point, they can now ferment.
If you don’t soak them, but instead grind them up right after harvesting them, you get a less nutritious flour. Think here of the difference between a regular matzah cracker and a graham cracker. The graham flour is sweeter (and more nutritious) due to the sprouted grain. The Egyptians were masters at fermentation.
Returning to the text, let’s think of this in terms of the food technologies available to the Israelites: we read that “the people took their dough before it was leavened, their kneading bowls wrapped in their cloaks upon their shoulders.” The word that means “their dough,” here, betzeko, is also the modern Hebrew word for dough.
They wrapped their “kneading bowls” in their cloaks, according to the JPS translation. But that’s not the only possibility. Others translate this word, mish’arotam, as “the remainder of the dough.” Why this variance? The root means “remainder,” yet in context it appears to be a kind of bowl. I think that the word means “remainder bowl” as in “fermentation bowl.”
According to this reading, the Israelites wrapped their fermentation bowls— necessary utensils—in their cloaks as they prepared to leave. If they were first introduced to these nifty bowls when they came to Egypt, they would want to take some of them with them when they left.
What do we do with the rest of the text? It says they took their dough before it was leavened. The word for “leavened” is chametz, probably a familiar word to you. The dough was not yet chametz.
Chametz, of course, does not mean “yeast.” We can, for example, have wine—a yeast product—during Passover. In current usage, chametz is a kind of grain that will react in some unspecified way when it has been in contact with water for longer than eighteen minutes.
Chametz, thus, is what happens when you let certain grains stand in water. What does grain (specifically, grain that has not been ground into plain flour) do if it stands in water? First it sprouts, and then it ferments. The root of chametz, in fact, means “to be sour, to ferment, to be leavened.”
Here is the point: the grains prohibited as chametz during Passover are those that ferment rather than rot when exposed to water.
This gives us new insight into the story. The Israelites do not have time to let their grain sit in water for three days, so they grind it and shape it into dough and bake it into cakes right away. That’s a process that can be done in the span of a day. But doing so presents a long-range logistics problem for them. If you don’t let the grain sprout and ferment, but rather grind it, make it into dough and then cook it, then you can no longer go back and complete that missed step.
They created a situation in which it was impossible to ferment their dough. Imagine matzah, for example: if you leave it in a dry place in an open box and return to it days later, what has happened? Nothing. It can sit there for a year without changing. And if you leave it in water for several days, what happens? It rots. There are not enough sugars in matzah to allow it to ferment.
Conversely, if you leave a graham cracker in water, what happens? If there’s yeast in there, it will start to bubble. It will ferment.
Which brings us to the two theological messages that are packed into this one little detail in the Passover story. Leaving without allowing the dough to rise meant that they had left one of the tools of Egyptian worship behind, for they could no longer make beer. Fermentation was no longer possible.
But it also meant that the Israelites were seriously unprepared for their trip. It’s the difference between heading out into the wilderness with energy bars versus heading out into the wilderness with matzah. It’s not surprising, then, that they started complaining almost immediately.
Not having enough time for their dough to ferment meant that they had to take a leap of faith to go out into the desert and follow Moses. They were utterly dependent on a miracle at that point, because their provisions were inadequate for the task.
I would not recommend that you head into the wilderness with nothing but a box of matzah. That’s not the message of the story. Rather, I suggest that you open a place in your worldview for the unexpected outcome. Accepting this possibility doesn’t have to involve the suspension of the laws of science—that’s not what’s important here—but rather, it requires accepting that sometimes a solution that you never envisioned, one that feels nothing short of miraculous, can still appear. Sometimes your universe breaks open and a whole new possibility makes itself known. Let it. Perhaps it is the start of redemption.
This article was originally featured in the Mar/Apr/May 2026 issue of the Vine.