(Mishnah): A Neder takes effect on another Neder, but a Shevu'ah does not take effect on a Shevu'ah;

If one said "I will be a Nazir if I eat, I will be a Nazir if I eat", and he ate, he must conduct one Nezirus for each time he said so;

If he said "Shevu'ah, I will not eat this. Shevu'ah, I will not eat this" and he ate it, he is liable only once.

(Gemara - Rav Huna): This is only if he said "I will be a Nazir today (if I eat), I will be a Nazir tomorrow..." Since the latter Nezirus finishes a day later, it takes effect;

If he said "I will be a Nazir today, I will be a Nazir today," the latter Nezirus does not take effect.

(Shmuel): Even if he said "I will be a Nazir today, I will be a Nazir today", both take effect.

Question: According to Rav Huna, why did the Mishnah distinguish Shevuos from Nedarim? It should have taught that even a Neder takes effect on a Neder only if the latter Nezirus if for another day, but not if it is for the same day!

This is left difficult.

Question (Mishnah): A Neder takes effect on a Neder, but a Shevu'ah does not take effect on a Shevu'ah;

Question: What is the case?

Suggestion: The Nedarim are "I will be a Nazir today, I will be a Nazir tomorrow." The corresponding Shevuos are "Shevu'ah I won't eat figs, Shevu'ah I won't eat grapes."

Rejection: Surely, both Shevuos take effect!

Answer #1: Rather, the Shevuos were "I won't eat figs, I won't eat figs." The corresponding Nedarim were "I will be a Nazir today, I will be a Nazir today."

The Mishnah says that both take effect. This refutes Rav Huna!

Answer (and Answer #2 to Question (1)): Really, he said "I will be a Nazir today, I will be a Nazir tomorrow. The corresponding Shevuos were "I won't eat figs, I won't eat figs or grapes (Rosh; Ran - figs and grapes together)." The second oath does not take effect.

Question: The second oath takes effect!

(Rabah): If one swore "I won't eat figs. I won't eat figs and grapes", and he ate figs, and was Makdish a Korban for this, and then he ate grapes, the latter transgression is like Chetzi Shi'ur (a partial Isur), for which one does not bring a Korban.

(Had he not been Makdish a Korban, he would be liable also for the second oath.) Since the second oath takes effect on grapes, it takes effect also on figs!

Answer: Rav Huna disagrees with Rabah.

Question (Beraisa): If one accepted two terms of Nezirus, observed one, was Makdish a Korban for it, and then permitted his first Nezirus (through regret), what he observed counts for the second.

Question: If he said "I will be a Nazir today, I will be a Nazir tomorrow", how can the first count for the second? It does not include the last day!

We must say that he said "I will be a Nazir today. I will be a Nazir today." This shows that both take effect!