Exodus 26:20-24

And for the second side of the tabernacle on the north side there shall be 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 thou shalt make six boards.

And two boards shalt thou make for the corners of the tabernacle in the two sides.

And they shall be coupled together beneath, and they shall be coupled together above the head of it unto one ring: thus shall it be for them both; they shall be for the two corners.