Bible Riddle

A basic shape, a cooking utensil, a simple comparison, a tool for basic hygiene, a chance to do some hydrology and a mystery! This riddle has it all but the answer…see if you can fix that part:

Round like a dishpan and smaller than a bathtub. But the ocean can’t fill it. What is it?

You can read Amos 9:1-10 to find the word that works as an answer to this Bible riddle. Good luck!