Reference for Berakhot 39:9

ואב"א עין שלא רצתה לזון ממה שאינו שלו אין עין הרע שולטת בו:

in similar manner the Evil Eye has no power over the seed of Joseph. Or if thou wilt, say that the eye which desired not to partake of what did not belong to it cannot be influenced by the Evil Eye.

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