Exode 26:19
And thou shalt make forty sockets of silver under the twenty boards; two sockets under one board for his two tenons, and two sockets under another board for his two tenons.
Exode 36:22
One board had two tenons, equally distant one from another: thus did he make for all the boards of the tabernacle.
Exode 36:24
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.