Exodus 26:19,25,32
And you shall 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.
Torrey's Topical Textbook—AKJV

Exodus 36:24,26,30,36
And forty sockets of silver he made under the twenty boards; two sockets under one board for his two tenons, and two sockets under another board for his two tenons.
Torrey's Topical Textbook—AKJV