Exodus 38:5

³  And he made all the vessels of the altar, the pots, and the shovels, and the basins, and the fleshhooks, and the firepans: all the vessels thereof made he of brass.

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

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

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

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