The river babbles as it runs, and the silent fish runs with it.
There is a house on earth that rings with a clear voice. The house itself makes a sound, but its quiet guest makes none. Yet both of them run along together, the guest and the house as one. What are they?
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The house moves, and the guest would die if it ever left.
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A river and a fish
Source: Symphosius, Aenigmata, No. 12, late 4th or early 5th century