Exodus 26:19-21

American Standard Version

¹⁹ And thou shalt make forty sockets of silver under the twenty boards; two sockets under one board for its two tenons, and two sockets under another board for its two tenons: ²⁰ and for the second side of the tabernacle, on the north side, twenty boards, ²¹ and their forty sockets of silver; two sockets under one board, and two sockets under another board.