Exodus 12:30

12:30 Pharaoh got up in the night, along with all his servants and all Egypt, and there was a great cry in Egypt, for there was no house in which there was not someone dead.

Exodus 26:4

26:4 You are to make loops of blue material along the edge of the end curtain in one set, and in the same way you are to make loops in the outer edge of the end curtain in the second set.