Exodus 26:15-17

King James Version

¹⁵ And thou shalt make boards for the tabernacle of shittim wood standing up.

¹⁶ Ten cubits shall be the length of a board, and a cubit and a half shall be the breadth of one board.

¹⁷ Two tenons shall there be in one board, set in order one against another: thus shalt thou make for all the boards of the tabernacle.