Exodus 36:19 ASV

¹⁷  And he made fifty loops on the edge of the curtain that was outmost in the coupling, and fifty loops made he upon the edge of the curtain which was `outmost in' the second coupling.

¹⁸  And he made fifty clasps of brass to couple the tent together, that it might be one.

¹⁹  And he made a covering for the tent of rams' skins dyed red, and a covering of sealskins above.

²⁰  And he made the boards for the tabernacle, of acacia wood, standing up.

²¹  Ten cubits was the length of a board, and a cubit and a half the breadth of each board.