Commentary for Nedarim 93:2

אמר רבא ת"ש האומר לבנו קונם שאי אתה נהנה לי ומת יירשנו בחייו ובמותו ומת לא יירשנו ש"מ אדם אוסר דבר שברשותו לכשיצא מרשותו שמע מינה:

propounded: What [if one says to his neighbour.] 'Konam, if you enter this house,' and then he sells it or dies: Can one prohibit that which he owns [for the prohibition] to be effective even when it leaves his ownership, or not? — Said Raba, Come and hear: If one says to his son, 'Konam that you benefit not from me,' and he dies, he is his heir. [But if he explicitly stipulates] during his lifetime and he dies, he does not succeed him. This proves that one can prohibit that which he owns [for the prohibition] to hold good when it leaves his ownership. The proof is conclusive.

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