The Bible
Exodus 26
The tabernacle is to be built with ten curtains and with boards—A veil is to separate the holy place from the most holy place—The ark of testimony (with the mercy seat) is to be put in the most holy place.
15¶ And thou shalt make boards for the tabernacle of shittim wood standing up.
18And thou shalt make the boards for the tabernacle, twenty boards on the south side southward.
20And for the second side of the tabernacle on the north side there shall be twenty boards:
22And for the sides of the tabernacle westward thou shalt make six boards.
23And two boards shalt thou make for the corners of the tabernacle in the two sides.
26¶ And thou shalt make bars of shittim wood; five for the boards of the one side of the tabernacle,
28And the middle bar in the midst of the boards shall reach from end to end.
34And thou shalt put the mercy seat upon the ark of the testimony in the most holy place.