Exodus 26:21
along with their 40 silver bases, two bases under the first plank and two bases under each plank;
Treasury of Scripture Knowledge
Summary
                            And their forty sockets of silver; two sockets under one board, and two sockets under another board.                        
                    Two sockets under one board
Bible References
Two sockets under one board
                                        Exodus 26:19                                        
                                                            
                        and make 40 silver bases under the 20 planks, two bases under the first plank for its two tenons, and two bases under the next plank for its two tenons;