Exodus 26:15-19

15“Make upright frames of acacia wood for the tabernacle. 16Each frame is to be ten cubits long and a cubit and a half wide, That is, about 15 feet long and 2 1/4 feet wide or about 4.5 meters long and 68 centimeters wide 17with two projections set parallel to each other. Make all the frames of the tabernacle in this way. 18Make twenty frames for the south side of the tabernacle 19and make forty silver bases to go under them—two bases for each frame, one under each projection.