Exodus 36:20

18He made fifty clasps of bronze to couple the tent together, that it might be a unit.

19He made a covering for the tent of rams’ skins dyed red, and a covering of sea cow hides above.

20He made the boards for the tabernacle of acacia wood, standing up.

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

22Each board had two tenons, joined to one another. He made all the boards of the tabernacle this way.