Exodus 37:1-3

Bezalel made the ark [of the covenant] of acacia wood—it was two and a half cubits long, and one and a half cubits wide, and one and a half cubits high. And he overlaid it with pure gold inside and out, and made a molding (border) of gold to go all around [the top of it]. He cast four rings of gold for it on its four feet, two rings on one side and two rings on the other side.