Exodus 36:21-23

Amplified Bible, Classic Edition

²¹ The length of a board was ten cubits and the breadth one cubit and a half.

²² Each board had two tenons (projections) to fit into a mortise to form a clutch; he did this for all the boards of the tabernacle.

²³ And he made thus the boards [for frames] for the tabernacle: twenty boards for the south side,