A Roof, Three Walls, and Faith

The Hook

Picture a builder standing in front of a structure and asking a strange question: is this a wall? Not, is it strong, or tall, or beautiful. Is it, in the eyes of the law, a wall at all. Now imagine the answers the Rambam is willing to give. Yes, this is a wall, even though it is only a single handbreadth wide and stands off to the side. Yes, this is a wall, even though there is a visible gap of nearly three handbreadths between it and the floor, an opening a small child could crawl through. Yes, this is a wall, even though it is a human being who has no idea he is serving as one. And also: no, this is not a sukkah, even though it looks like a perfectly good little hut, because it is one handbreadth too tall.

Today's chapter is Hilchot Shofar, Sukkah and Lulav, chapter four, from Maimonides' Mishneh Torah, and it is almost entirely about measurements. Handbreadths and cubits, walls and gaps, roofs and poles. It reads at first like a contractor's manual. But stay with it, because hidden inside all this exacting geometry is one of the most beautiful ideas in the Torah: that a home fit for the Divine is not the one that is most solid, but the one that is most honest about being temporary, and that the law itself will lovingly complete whatever the builder leaves unfinished.

Ten Handbreadths and Not a Cubit More

The Rambam opens with the dimensions, and every one of them is a boundary in two directions. The sukkah may not be less than ten handbreadths high, and it may not be more than twenty cubits. It may not be less than seven handbreadths by seven at its floor, the minimum space to hold a person's head, most of his body, and a small table. Too small in any dimension, even by the slightest amount, and it is invalid. Too tall, even by the slightest amount, and it is invalid.

Look closely at that upper limit, because it is the soul of the chapter. Why twenty cubits? The Rambam explains that any structure taller than twenty cubits can only stand as a permanent building. Its walls have to be engineered for permanence, and a permanent dwelling is exactly what a sukkah is forbidden to be. The sukkah is a dirat arai, a temporary dwelling, and the moment it grows tall enough that it must be built to last, it stops being a sukkah at all. Here is a law that disqualifies a house for being too permanent. Think about how backwards that is to everything we usually chase. We spend our lives trying to make our shelters more solid, more lasting, more ours. The Torah takes one week a year and commands the opposite: build something that could blow away, and live in it as though it were home.

And the lower limit whispers its own secret. Ten handbreadths. The Talmud derives that number from the ark in the Holy of Holies, whose cover rose ten handbreadths high, marking the line between the space where the Divine Presence rested and everything below it. Ten handbreadths is the minimum height at which a space becomes a genuine domain, a real inside. So the fragile hut in your backyard must reach exactly the height at which the Shechinah once drew its boundary. The most temporary house in Jewish life must be at least as tall as the space of holiness.

The Wall That Isn't There

Then comes the strangest and most wonderful stretch of the chapter, where the Rambam builds walls out of almost nothing. A sukkah needs three walls, but watch how generous the law becomes about what counts. If you have two proper walls meeting at a corner, the third wall can be a mere handbreadth wide, placed close to one of them, and then finished off with a tzurat hapetach, the form of a doorway, two posts and something across the top that need not even touch them. A handbreadth of board and the suggestion of a door, and the law declares a third wall to exist.

The engine underneath this is a principle called l'vud, and it is quietly astonishing. Wherever there is a gap of three handbreadths or less, the law considers it closed, the two sides joined as if the space between them were solid. A wall that hangs from the roof and stops short of the ground is invalid if the gap is more than three handbreadths, because an animal could pass beneath it. But if the gap is less than three, l'vud seals it, and the hanging wall is kosher as though it reached the earth. There is even a principle called gud asik, extend and raise up, by which a wall that reaches ten handbreadths is imagined to continue upward until it meets the roof, even when in reality it does not. The law looks at an incomplete structure and completes it. It sees the gap, and it does not pretend the gap is not there. It declares, with full authority, that the gap does not break the wall.

This is not a loophole. It is a philosophy. The sukkah is the dwelling where God is invited to rest, and the law that governs it insists that a dwelling for holiness need not be seamless. It can be full of gaps, held together by principles rather than by matter, finished in the mind of the law rather than by the hand of the builder. The Alter Rebbe teaches that the sukkah surrounds a person with an encompassing light, an ohr makif, a holiness that wraps around you from beyond rather than being grasped from within. A structure made mostly of openings, sealed by l'vud, is the perfect vessel for a light that comes from surrounding you rather than being contained.

A Wall of Flesh

The Rambam then does something that should take your breath away. He rules that a person can be a wall of the sukkah. You may stand your friend at the edge and let him serve as the boundary, and then eat, drink, and sleep in a sukkah whose wall is a living human being. He builds walls out of trees too, if you bind them and fill the gaps so the wind cannot sway them, so that the branches become a solid continuum. Living things, swaying things, breathing things, pressed into service as the walls of the house of faith.

But there is a delicate condition. You may use a person as a wall only when he does not know he is being used that way, when his standing there is unconscious. The moment he knows, on the festival itself, it becomes a problem, because now he is deliberately forming a partition. The wall works best when it is offered without calculation, when the person is simply present rather than performing. Is there a more human image of how holiness gets built? The walls that truly hold us up are so often the people who never knew they were holding us, who were simply there, unaware they had become the boundary that made a fragile life into a dwelling.

The Unifying Principle

Pull the chapter together and a single vision emerges. Every ruling pushes in the same direction. The dwelling must be temporary, never permanent. Its walls may be minimal, incomplete, hanging in the air, or made of flesh. Its gaps are sealed not by matter but by law. And still, out of all this insufficiency, the Torah declares a kosher home, a place fit for a person to leave his solid house and dwell under the Divine Presence for seven days. The sukkah is a monument to the idea that holiness does not require perfection of structure. It requires only enough of a boundary, honestly temporary, for the surrounding light to gather.

The Baal Shem Tov taught that the whole world is, as it were, God's sukkah, a temporary dwelling He built and enters, fragile by design so that the One who fills it is never confused with the walls. And the Lubavitcher Rebbe drew out the intimacy of it: on Sukkot we say ana nasiv malka, let us take in the King, and the place we take Him into is not a fortress but a hut, because love does not need a fortress. It needs only to be real, and to be shared.

Modern Application

You have spent a great deal of energy trying to make your life permanent. A sturdier home, a more secure position, walls thick enough that nothing can get through. And some part of you suspects that until the structure is finished, until every gap is sealed and every wall is solid, you are not yet living the real life, only preparing for it. Chapter four is the Torah taking that anxiety apart handbreadth by handbreadth.

The law says the gaps do not disqualify you. It says a wall three-quarters missing still holds, that l'vud seals what you could not seal, that a boundary hanging in the air with nothing beneath it is a kosher wall. It says the people who steady your life were mostly unaware they were doing it, and that this is exactly how it should be. Sfat Emet calls the sukkah the shade of faith, tzila d'meheimnusa, and faith is precisely the willingness to dwell in a structure you did not finish and cannot fully see, trusting that the law of heaven completes what your hands left open. You do not have to wait for the walls to be solid. You are allowed to move into the unfinished house and call it home, because the Presence that fills it was never waiting on your masonry.

The Closing

We started with a builder asking whether his ramshackle structure counts as a wall, and the law kept surprising him with yes. Yes to the handbreadth of board. Yes to the gap the eye can see. Yes to the friend who did not know. And one firm no, reserved for the house that tried too hard to last forever.

Go and stand, even in your imagination, inside a small hut with three barely-there walls and a roof you can see the stars through. Feel how little is actually holding it up, and how completely it holds you. That is the secret the measurements were guarding all along. A home for the Divine is not built by sealing every gap. It is built by putting up just enough, honestly and temporarily, and trusting heaven to close the distance. Ten handbreadths high, seven across, three walls where the third is almost nothing. It is more than enough. It was always meant to be almost nothing, so that the One who fills it would be unmistakable.