Exodus 26:28
They will run halfway up the boards, from one end to the other.
You are to make five crossbars of acacia wood to hold together the boards for one side of the tabernacle,
So there will be eight boards with sixteen silver bases: two bases under the first board, and so on.
These boards must be joined at the bottom and top, up to the level of the first ring; and the same for the two boards that are to form the two corners.
You are to make forty silver bases for putting under the twenty boards thus: two bases under the first board to receive its two matching arms, and so on for the other boards.