Exodus 38:6

4And he made for the altar a brasen grate of network under the compass thereof beneath unto the midst of it.

5And he cast four rings for the four ends of the grate of brass, to be places for the staves.

6And he made the staves of shittim wood, and overlaid them with brass.

7And he put the staves into the rings on the sides of the altar, to bear it withal; he made the altar hollow with boards.

8And he made the laver of brass, and the foot of it of brass, of the lookingglasses of the women assembling, which assembled at the door of the tabernacle of the congregation.