Commentary for Ketubot 155:4

ר"ש חולק בין נכסים לנכסים נכסים הידועין לבעל לא תמכור ואם מכרה ונתנה בטל שאינן ידועין לבעל לא תמכור ואם מכרה ונתנה קיים:

Rabbi Shimon distinguishes between one kind of property and another: Property that is known to the husband [the wife] may not sell, and if she has sold it or given it away her act is void; [Property] which is unknown to the husband she may not sell, but if she has sold it or given it away her act is legally valid.

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