Exodus 26:17-19

Complete Jewish Bible

¹⁷ There are to be two projections on each plank, and the planks are to be joined one to another. That is how you are to make all the planks for the tabernacle.

¹⁸ “Make the planks for the tabernacle as follows: twenty planks for the south side, facing southward. ¹⁹ Make forty silver sockets under the twenty planks, two sockets under one plank for its two projections and two sockets under another plank for its two projections.