Exodus 26:26-30

“Then you shall make [fifteen] bars of acacia wood: five for the boards of one side of the tabernacle, and five bars for the boards of the other side of the tabernacle, and five bars for the boards of the rear end of the tabernacle, for the back wall toward the west. And the middle bar in the center of the boards shall pass through [horizontally] from end to end. You shall overlay the boards with gold and make their rings of gold to hold the bars. You shall overlay the bars with gold. You shall erect the tabernacle according to its plan [the direction corresponding to its meaning and purpose] which has been shown to you on the mountain.