Exodus 16:15

16:15 When the Israelites saw it, they said to one another, “What is it?” because they did not know what it was. Moses said to them, “It is the bread that the Lord has given you for food.

Exodus 26:5

26:5 You are to make fifty loops on the one curtain, and you are to make fifty loops on the end curtain which is on the second set, so that the loops are opposite one to another.

Exodus 36:12

36:12 He made fifty loops on the first curtain, and he made fifty loops on the end curtain that was in the second set, with the loops opposite one another.