A Naughty Trio Riddle

Riddle: I give you a group of three. One is sitting down, and will never get up. The second eats as much as is given to him, yet is always hungry. The third goes away and never returns. What are the three things?

Answer: Stove, fire, and smoke. Source: https://riddles.com/60

I give you a group of three. One is sitting down, and will never get up. The second eats as much as is given to him, yet is always hungry. The third goes away and never returns. What are the three things? — A Naughty Trio Riddle by Anonymous Riddle