Exodus 36:23 ASV

²¹  Ten cubits was the length of a board, and a cubit and a half the breadth of each board.

²²  Each board had two tenons, joined one to another: thus did he make for all the boards of the tabernacle.

²³  And he made the boards for the tabernacle: twenty boards for the south side southward.

²⁴  And he made forty sockets of silver under the twenty boards; two sockets under one board for its two tenons, and two sockets under another board for its two tenons.

²⁵  And for the second side of the tabernacle, on the north side, he made twenty boards,