שמות, פרק כ״ו, פסוק כ״ו

Building a portable structure in the desert required a highly stable foundation. To ensure the walls of the Tabernacle remained perfectly straight and did not lean, a specialized engineering support system was designed [קאסוטו, ביאור שטיינזלץ]. Long wooden beams acted as locking bars, passing across the structure to bind the individual boards tightly together [רש״י, ביאור יש״ר].

Five bars were required for each wall. The primary approach among commentators is that only three rows of bars were actually visible on the outside. The top and bottom rows were each composed of two separate beams that extended from the edges of the wall and met in the middle. The central row, however, was a single continuous piece that spanned the entire length of the wall. Together, these form the five bars: two on top, two on the bottom, and one in the middle [רש״י, רלב״ג, מלבי״ם, ביאור יש״ר]. Conversely, a different perspective suggests a simpler arrangement, where five distinct, full-length bars ran parallel to one another down the height of the wall [רשב״ם].

Connecting these bars to the boards required precise planning. The upper and lower bars were threaded through rings attached to the exterior of the boards. The placement of these rings divided the height of each board into what commentators refer to as a "triangle." Even though the board was divided into four equal vertical sections, the three lines of bars distributed the structural load perfectly evenly. Each bar supported an equal portion of the board above and below it, similar to the balanced geographic distribution of the cities of refuge in the land of Israel [רש״י, מזרחי, שפתי חכמים, גור אריה, חזקוני, ברכת אשר על התורה].

Unlike the exterior bars that slipped through outer rings, the middle bar functioned entirely differently. The boards themselves were pierced through their thickness, allowing the middle bar to pass directly inside the hollowed-out center of the wood. This internal alignment granted the structure immense inner strength [רש״י, רשב״ם, רלב״ג]. The length of this middle bar was thirty cubits on the north and south walls, and twelve cubits on the western wall. While some maintain that these were straight, individual bars for each respective wall, a miraculous tradition offers a different view. According to this account, the middle bar was actually a single, continuous beam that wrapped around all three sides of the Tabernacle. It would miraculously bend on its own at the corners, seamlessly transitioning from wall to wall to unite the entire building [רש״י, רשב״ם, מזרחי, מלבי״ם].

To complete the majesty of this structural system, the wooden bars were completely overlaid with gold [אבן עזרא הקצר].