Exodus 38:7-11

7He put the poles through the rings on the sides of the altar, with which to carry it; he made it hollow with planks.

8Bezalel made the basin and its base of bronze from the mirrors of the attending women who served and ministered at the doorway of the Tent of Meeting.

9Then he made the court: for the south side the curtains of the court were of fine twisted linen, a hundred cubits;

10their twenty support poles, and their twenty bronze sockets; the hooks of the support poles and their connecting rings were silver.

11And for the north side [of the court the curtains were also] a hundred cubits; their twenty support poles and their twenty bronze sockets; the hooks of the support poles and their connecting rings were silver.