Exodus 26:11

And you shall make fifty brazen rings; and you shall join the rings by the loops, and you shall join the skins, and they shall be one.

And thou shalt make fifty taches of brass, and put the taches into the loops, and couple the tent together, that it may be one.

You shall make fifty clasps of bronze, and put the clasps into the loops, and couple the tent together, that it may be one.