Exodus 26:18-21

18You shall make the boards for the tabernacle: twenty boards 1for the south side.

19You shall make forty 23sockets of silver under the twenty boards, two 4sockets under one board for its two tenons and two 5sockets under another board for its two tenons;

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

21and their forty 6sockets of silver; two 7sockets under one board and two 8sockets under another board.