Exodus 26:17
Two tenons shall there be in one board, set in order one against another: thus shalt thou make for all the boards of the tabernacle.
Exodus 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.
Exodus 36:22
One board had two tenons, equally distant one from another: thus did he make for all the boards of the tabernacle.
Exodus 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.