Exodus 26:26-28

26“Then you shall make 1bars of acacia wood, five for the boards of one side of the tabernacle,

27and five bars for the boards of the 2other side of the tabernacle, and five bars for the boards of the side of the tabernacle for the 3back side to the west.

28The middle bar in the 4center of the boards shall pass through from end to end.