do you need to refrigerate cooked oats?

I'm thinking of making oat balls as snacks to eat through the day.
But I wonder whether the oats have to be refrigerated once cooked.
I only cook the oats in water.
these are old-fashioned oats.

I called Quaker Oats, but they weren't so sure. They did suggest that you could eat the oats from the box raw or mix with nuts like a trail mix.

They also suggested their granola bars - but that has sugar.

Your thoughts?

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