Exodus 36:23-25

Amplified Bible

²³ And [this is how] he made the boards [for frames] for the tabernacle: twenty boards for the south side; ²⁴ and he made under the twenty boards forty silver sockets; two sockets under one board for its two tenons (dovetails), and two sockets under another board for its two tenons. ²⁵ For the other side of the tabernacle, the north side, he made twenty boards,