Exodus 36:24 (KJV)

And he made a covering for the tent of rams' skins dyed red, and a covering of badgers' skins above that.

And he made boards for the tabernacle of shittim wood, standing up.

The length of a board was ten cubits, and the breadth of a board one cubit and a half.

One board had two tenons, equally distant one from another: thus did he make for all the boards of the tabernacle.

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

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 two boards made he for the corners of the tabernacle in the two sides.

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.