Exodus 26:18-20

King James Version

¹⁸ And thou shalt make the boards for the tabernacle, twenty boards on the south side southward.

¹⁹ And thou shalt make forty sockets of silver under the twenty boards; two sockets under one board for his two tenons, and two sockets under another board for his two tenons.

²⁰ And for the second side of the tabernacle on the north side there shall be twenty boards: