Exodus 26:17

Two tenons must be connected to each other for each frame. Make all the frames of the tabernacle in this way.

Note That is, projecting pieces of wood made for insertion into another piece; similarly in verse 19.

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.

Note tenons: Heb. hands

There shall be two tenons in each board, joined to one another: thus you shall make for all the boards of the tabernacle.

Two tenons shall there be in each board, joined one to another: thus shalt thou make for all the boards of the tabernacle.