Reference for Ketubot 166:8

אם תמצי לומר פירי פירות דוקא עד עולם למה לי הא קמ"ל כיון דכתב לה פירי פירות כמאן דכתב לה עד עולם דמי

If you say [that the expression] “the usufruct of the usufruct” is essential, what need was there to say “without end”? It teaches us: Since he wrote, “the usufruct of the usufruct” it is as if he wrote “without end.” But if you say that “without end” is the essential phrase, why did it need to mention “the usufruct of the usufruct”?

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