Nedarim, Chapter 7, Mishnah 7. Our Mishnah deals with a man who forbids upon himself by a vow the handiwork of his wife, and with the difference between wording that forbids deriving any benefit and wording that forbids eating alone.
Wordings of the vow that forbid deriving benefit:
"Konam ma'aseh yadayich alai" - one who says this to his wife forbids upon himself by a vow any benefit from her handiwork, from the work and the activity that she does.
"Konam hen al pi" - this wording too refers to a prohibition of benefit.
"Konam hen l'fi" - even though its meaning is directed at the mouth, it still contains a hint that he is to derive no benefit at all from her handiwork.
Therefore, as we learned in the previous Mishnah, "asur b'chilufeihen u'v'giduleihen" - he is forbidden even in what is exchanged for her handiwork and in what grows from it. That is, if he sold the item she produced or traded it, the money he received in return or the object he received in exchange is forbidden to him for any benefit. So too, if she planted a tree, even the fruit that comes from it is forbidden.
Wording that forbids eating alone:
By contrast, if he used the wording "she'eini ochel" (that I will not eat) or "she'eini to'em" (that I will not taste), he did not forbid her handiwork for benefit, but only for eating. Therefore "mutar b'chilufeihen u'v'giduleihen" - he is permitted in what is exchanged for them and in what grows from them, since a prohibition of benefit includes even the exchange and the growth, whereas a prohibition of eating applies only to the item itself.
Between an item whose seed decomposes and one whose seed does not:
An item whose seed decomposes: The permission regarding what grows from it was stated specifically about an item whose seed breaks down and decomposes in the ground, and therefore nothing of the original item remains present in the growth.
An item whose seed does not decompose: "Ha lo davar she'ein zar'o kaleh" - with an item that does not break down, but rather continues to grow beneath the ground while the original item remains intact, even "giduley giduleihen" (the growth of the growth) is forbidden, since at their base something of the original item is still present.
In summary: In this Mishnah we learned that the wordings "Konam ma'aseh yadayich alai," "Konam hen al pi" and "Konam hen l'fi" forbid deriving benefit, and therefore he is forbidden even in what is exchanged for her handiwork and in what grows from it; whereas the wordings "she'eini ochel" and "she'eini to'em" forbid only eating, and therefore he is permitted in what is exchanged for them and in what grows from them. This permission applies to an item whose seed decomposes, but with an item whose seed does not decompose, even the growth of the growth is forbidden.