Exodus 26:25

והיו שמנה קרשים AND THEY SHALL BE EIGHT BOARDS — These are the same boards mentioned above (vv. 22—23): “Thou shalt make six boards” … “and two boards shalt thou make for the corners”; consequently there were eight boards in the western row. The following is stated in that Mishna (paragraph) in the Boraitha dealing with “The structure of the Tabernacle” which treats of the method of arranging the boards of the Tabernacle: they made the sockets hollow, and cut away the board at the bottom, a quarter of its width being left on one side and a quarter on the other side, the portion cut away in the middle being one half its width. Thus they made for it (the board) two tenons like two חמוקין — I think the correct reading is, “like two חווקין” i. e. like two rungs of a ladder set at some distance one from the other. These were planed down so as to fix into the hollow of the socket just as a rung which is fixed into the hole in the ladder’s upright. This is the meaning of משלבות, viz., made like a rung (שליבה). They fixed them (the two tenons) into the two sockets as it says, (v. 19) “two sockets [under one board for its two tenons] and two sockets [under another board for its two tenons]”. They cut out the board at the top a finger breadth on this side and a finger breadth on that side and put them (two semicircular projecting pieces on two adjacent boards) into one golden ring in order that they (the boards) should not fall apart, as it says, “and they shall be coupled together beneath, [and they shall be coupled together above].” Thus the Mishna; its explanation I have set forth above following the order of the verses.

וְהָיוּ֙ שְׁמֹנָ֣ה קְרָשִׁ֔ים וְאַדְנֵיהֶ֣ם כֶּ֔סֶף שִׁשָּׁ֥ה עָשָׂ֖ר אֲדָנִ֑ים שְׁנֵ֣י אֲדָנִ֗ים תַּ֚חַת הַקֶּ֣רֶשׁ הָאֶחָ֔ד וּשְׁנֵ֣י אֲדָנִ֔ים תַּ֖חַת הַקֶּ֥רֶשׁ הָאֶחָֽד׃

And they shall be eight boards, and their sockets of silver, sixteen sockets; two sockets under one board, and two sockets under another board.