Exodus 30:18

Thou shalt also make a laver of brass, of copper or one of its chief alloys, and his foot also of brass, to wash withal; and thou shalt put it between the Tabernacle of the Congregation and the altar, between the altar of burnt offerings in the court and the entrance to the Holy Place, and thou shalt put water therein. For this laver, or great wash-basin, the Israelitish women brought their metal mirrors, Exodus 38:8, glad to contribute what they could for this sacred purpose.