Commentary for Ketubot 117:11

אמר ליה אביי בשלמא אדם אוסר פירות חבירו עליו שכן אדם אוסר פירותיו על חבירו יאסר דבר שלא בא לעולם על חבירו שכן אין אדם אוסר פירות חבירו על חבירו

Abaye said to him: It makes sense that a man can forbid the use of the fruit of his fellow to himself, since he may also forbid his own fruit to his fellow. But does he have the right to forbid something that is not yet in existence, seeing that a man cannot forbid the fruit of his fellow to his fellow?

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