Mon Nedarim 50

R ' Akiva offered a Pesach to his father-in-law: would you have made the Neder if your son-in-law would become a budding scholar. His father-in-law replied: I wouldn't have made it if he would learn one Perek or one Halacha.

Ran asks: we know that we cannot Matir Neder on a factor that was not present when he made the Neder. This is known as Nolad. One cannot say if he made a Neder on an ignoramus if I knew he would become a scholar I wouldn't have made the Neder, since he wasn't a scholar when he made the Neder. Therefore, how could R' Akiva make such a Pesach that's basid on Nolad?

Ran answers : since they already made up that he'll join the Yeshiva to become a scholar. Therefore it's not Nolad, because by such a person we can assume that he ought to learn at least a Perek or Halacha.