17 There shall be two tenons in each board, joined to one another: thus you shall make for all the boards of the tabernacle.
*Minor differences ignored. Grouped by changes, with first version listed as example.
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" (r), 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.
(r) "duae manus", Montanus.
Every board was to have two ידות (lit., hands or holders) to hold them upright, pegs therefore; and they were to be "bound to one another" (משׁלּב, from שׁלב in Chald. to connect, hence שׁלבּים in 1-Kings 7:28, the corner plates that hold together the four sides of a chest), not "pegged into one another," but joined together by a fastening dovetailed into the pegs, by which the latter were fastened still more firmly to the boards, and therefore had greater holding power than if each one had been simply sunk into the edge of the board.
*More commentary available at chapter level.