Exodus 26:17
Two tenons must be connected to each other for each frame. Make all the frames of the tabernacle in this way.
Berean Standard Bible
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.
There shall be two tenons in each board, joined to one another: thus you shall make for all the boards of the tabernacle.