Exodus 26:19
King James Version
“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.”
Context
16Ten cubits the length of a board, and a cubit and a half the breadth of one board.
17Two tenons in one board, set in order one against another: thus shalt thou make for all the boards of the tabernacle.
18And thou shalt make the boards for the tabernacle, twenty boards on the south side southward.
19And 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.
20And for the second side of the tabernacle on the north side twenty boards:
21And their forty sockets silver; two sockets under one board, and two sockets under another board.
22And for the sides of the tabernacle westward thou shalt make six boards.