Exodus 36:23

He made the boards for the tabernacle of acacia wood, standing up.

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

Each board had two tenons, joined to one another. He made all the boards of the tabernacle this way.

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.

For the second side of the tabernacle, on the north side, he made twenty boards

and their forty sockets of silver: two sockets under one board, and two sockets under another board.