Exodus 38:3-7

3He made all the altar’s utensils: the pots, shovels, basins, meat forks, and firepans; he made all its utensils of bronze.

4He constructed for the altar a grate of bronze mesh under its ledge, halfway up from the bottom.

5He cast four rings at the four corners of the bronze grate as holders for the poles.

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

7Then he inserted the poles into the rings on the sides of the altar in order to carry it with them. He constructed the altar with boards so that it was hollow.