Exodus 36:31

29They were double beneath, and in the same way they were all the way to its top to one ring. He did this to both of them in the two corners.

30There were eight boards and their sockets of silver, sixteen sockets—under every board two sockets.

31He made bars of acacia wood: five for the boards of the one side of the tabernacle,

32and five bars for the boards of the other side of the tabernacle, and five bars for the boards of the tabernacle for the hinder part westward.

33He made the middle bar to pass through in the middle of the boards from the one end to the other.