Exodus 36:27

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 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.