You shall make forty sockets of silver under the twenty boards: two sockets under each of the boards for its two tenons.
Exodus 26:19
Surrounding context
26:18 And you shall make the boards for the tabernacle, twenty boards for the south side.
26:19 You shall make forty sockets of silver under the twenty boards: two sockets under each of the boards for its two tenons.
26:20 And for the second side of the tabernacle, the north side, there shall be twenty boards