Exodus 38:6

4He made for the altar a grating of a network of bronze, under the ledge around it beneath, reaching halfway up.

5He cast four rings for the four corners of bronze grating, to be places for the poles.

6He made the poles of acacia wood, and overlaid them with bronze.

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

8He made the basin of bronze, and its base of bronze, out of the mirrors of the ministering women who ministered at the door of the Tent of Meeting.