Reference for Bava Metzia 58:22

איבעית אימא לא קשיא הא בדעמרא הא בדכיתנא

Moreover, 'if he opens it in his own interests, It is forbidden; 'but have you not said, 'He may open and read it'! — It means this: If when rolling it he opens and reads it, that is permitted; but if he opens it in his own interests, it is forbidden.

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