Cross reference
Exodus 26:17
17 Every board is to be joined to the one nearest to it by two tongues, and so for every board in the House.
Exodus 26:19
19 With forty silver bases under the twenty boards, two bases under every board to take its tongues.
Exodus 36:22
22 Every board had two tongues fixed into it; all the boards were made in this way.
Exodus 36:24
24 And for these twenty boards, forty silver bases, two bases under every board, to take its tongues.