Exodus 26:21 KJV
And their forty sockets of silver; two sockets under one board, and two sockets under another board.
Exodus 26:21, King James Version
In context
20 And for the second side of the tabernacle on the north side there shall be twenty boards:
21 And their forty sockets of silver; two sockets under one board, and two sockets under another board.
22 And for the sides of the tabernacle westward thou shalt make six boards.