Exodus 26:19
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.
Cross-reference
Exodus 26:25 applies the same two-sockets-per-board pattern to the eight boards of the west side.
Exodus 26:17 describes the tenons on each board that fit into the sockets specified here.
Exodus 26:21 gives the same socket pattern for the north side, mirroring the south side instruction here.
Exodus 26:37 describes bronze sockets for the screen pillars, contrasting with the silver sockets for the boards here.
Exodus 36:24-26 records the literal execution: forty silver sockets made exactly as commanded for the south and north sides.
Exodus 38:27 gives the total count of silver sockets and their weight, summarizing the fulfillment of this command.
In Exodus 40:18, Moses lays the sockets from this instruction when erecting the tabernacle.
Exodus 27:10 mentions bronze sockets for court pillars, a different material from the silver sockets for the tabernacle boards.
Numbers 3:36 assigns the sockets of the tabernacle to the Merarites' charge, referencing the same items.
Numbers 4:31 includes the sockets in the service of the Merarites, directly repeating the inventory here.