Midrash 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.
Sifrei Devarim
"and thus shall you do with his garment": A garment is shaken out once in thirty days. He spreads it out for its need (i.e., to preserve it), but not for his honor.
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