Exodus 36:18

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

Fifty clasps made of brass were fashioned to fasten the curtains of the tent together so that the separate hangings were coupled into one unified whole. The number, the material, and the joining function all belong to the careful workmanship required for the tabernacle. That precise coupling shows that labor performed for God was to be carried out with exactness and developed skill. Every detail was to follow the pattern revealed to Moses, leaving no room for carelessness or improvisation.