Exodus 26:18-21

18So you are to make the frames for the tabernacle: twenty frames for the south side,

19and you are to make forty silver bases to go under the twenty frames – two bases under the first frame for its two projections, and likewise two bases under the next frame for its two projections;

20and for the second side of the tabernacle, the north side, twenty frames,

21and their forty silver bases, two bases under the first frame, and two bases under the next frame.