“There shall be two tenons in each board, joined to one another: thus you shall make for all the boards of the tabernacle.”
Exodus 26:17 (WEB)
Context Reading
15“You shall make the boards for the tabernacle of acacia wood, standing upright. 16Ten cubits shall be the length of a board, and one and a half cubits the width of each board. 17There shall be two tenons in each board, joined to one another: thus you shall make for all the boards of the tabernacle. 18You shall make twenty boards for the tabernacle, for the south side southward. 19You shall make 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.