Detective Mehul and The scary cave - Detective Riddle

Once as detective Mehul was walking around the forest trying to catch Dhamaka Singh, he came across a cave. He suspected that Dhamaka Singh was hiding inside it. But to open it he needed to solve a riddle- "You tell it not to come, but it still comes. You tell it not to go, but it still goes by. What is it?" can you help him?

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