Exodus 26:20-24

20For the other side, the north side of the tabernacle, make twenty frames 21and forty silver bases—two under each frame. 22Make six frames for the far end, that is, the west end of the tabernacle, 23and make two frames for the corners at the far end. 24At these two corners they must be double from the bottom all the way to the top and fitted into a single ring; both shall be like that.