Exodus 36:21

“The length: Each of these boards, taking the cubit at nearly twenty-two inches, was about eighteen feet long, and two feet nine inches broad. As these boards are said to be standing up ( Exo 36:20), their length was consequently the height of the tabernacle; and as the two sides were composed of twenty of these, standing up ( Exo 36:23 and Exo 36:25), and the west end of six, with two boards to project at the corners ( Exo 36:27 and Exo 36:28), the tabernacle must therefore, have been thirty cubits, or fifty-five feet long, and about ten cubits, or eighteen feet broad. These boards were fastened at the bottom by two tenons in each board, which fitted into two mortices in the foundation, at…”