Exodus 38:2-7
2 And he made the horns thereof on the four corners of it; the horns thereof were of the same: and he overlaid it with brass.
3 And he made all the vessels of the altar, the pots, and the shovels, and the basons, and the fleshhooks, and the firepans: all the vessels thereof made he of brass.
4 And he made for the altar a brasen 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.