Exodus 36:28 (KJV)

And he made boards for the tabernacle; twenty boards for the south side southward:

And forty sockets of silver he made under the twenty boards; two sockets under one board for his two tenons, and two sockets under another board for his two tenons.

And for the other side of the tabernacle, which is toward the north corner, he made twenty boards,

And their forty sockets of silver; two sockets under one board, and two sockets under another board.

And for the sides of the tabernacle westward he made six boards.

And they were coupled beneath, and coupled together at the head thereof, to one ring: thus he did to both of them in both the corners.

And there were eight boards; and their sockets were sixteen sockets of silver, under every board two sockets.

And he made bars of shittim wood; five for the boards of the 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 tabernacle for the sides westward.

And he made the middle bar to shoot through the boards from the one end to the other.