Exodus 26:16-21

16Ten cubits shall be the length of 1each board and one and a half cubits the width of each board.

17There shall be two tenons for each board, 2fitted to one another; thus you shall do for all the boards of the tabernacle.

18You shall make the boards for the tabernacle: twenty boards 3for the south side.

19You shall make forty 45sockets of silver under the twenty boards, two 6sockets under one board for its two tenons and two 7sockets under another board for its two tenons;

20and for the second side of the tabernacle, on the north side, twenty boards,

21and their forty 8sockets of silver; two 9sockets under one board and two 10sockets under another board.