Remove the dross from the silver, and material ¹  for the silversmith will emerge;

You counted the houses in Jerusalem, ¹  and demolished houses so you could have material to reinforce the wall. ² 

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 ¹  in the outer edge of the end curtain in the second set.

He made loops of blue material along the edge of the end curtain in the first set; he did the same along the edge of the end curtain in the second set.