Exodus 26:19, 21, 25, 32

You shall make forty sockets of silver under the twenty boards: two sockets under each of the boards for its two tenons.

and their forty sockets of silver: two sockets under each of the boards.

So there shall be eight boards with their sockets of silver—sixteen sockets—two sockets under each of the boards.

You shall hang it upon the four pillars of acacia wood overlaid with gold. Their hooks shall be gold, upon four sockets of silver.