John Gill Commentary Exodus 26:17

"Two tenons shall there be in each board, joined one to another: thus shalt thou make for all the boards of the tabernacle." — Exodus 26:17 (ASV)

Two tenons shall there be on one board
Every board was to be so cut and shaped at the lower end of it, as to have, as it were, "two hands" ^F18 , as in the original, to enter into, lay hold on, and fasten in mortises:

set in order one against another ;
at a proper distance from each other, as the rounds of a ladder:

thus shalt thou make for all the boards of the tabernacle ;
everyone was to have two tenons.

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FOOTNOTES:

• F18: (twdy ytv) "duae manus", Montanus.