Kiddushin 76B

מוקים לה בלויה ובת ישראל. אלא מתניתא נימא פליגא? לא, מאי ״עוד אחת״⁠ – זוג אחת.

he interprets his statement as referring to a Levite woman or an Israelite woman, about whom the Mishnah states that one must investigate one additional generation. Therefore, Rav Adda bar Ahava’s ruling accords with that of the Mishnah. But should we say the baraita disputes the Mishnah? The Talmud rejects this: No, what is the meaning of the Mishnah’s phrase: One additional? It means one pair, i.e., two more mothers on each side.

אמר רב יהודה אמר רב: זו דברי רבי מאיר, אבל חכמים אומרים: כל משפחות בחזקת כשרות הן עומדות. איני? והאמר רב חמא בר גוריא אמר רב: משנתינו כשקורא עליו ערער! מאן דמתני הא ⁠– לא מתני הא.

Rav Yehuda says that Rav says: This Mishnah presents the statement of R' Meir, but the Rabbis say: All families retain a presumptive status of fitness, and do not require investigation. The Talmud asks: Is that so, did Rav really say this? But doesn’t Rav Ḥama bar Gurya say that Rav says: Our Mishnah is referring only to a case when an objection was registered about the family concerning its lineage, but if no objection was registered, everyone agrees that the family retains its presumptive status of fitness. The Talmud answers: The one who taught this statement in the name of Rav did not teach that other statement.

איכא דאמרי אמר רב יהודה אמר רב: זו דברי רבי מאיר, אבל חכמים אומרים: כל משפחות בחזקת כשרות הן עומדות. אמר רב חמא בר גוריא אמר רב: אם קורא עליו ערער, צריך לבדוק אחריה.

There are those who say that this discussion occurred as follows: Rav Yehuda says that Rav says: This Mishnah presents the statement of R' Meir, but the Rabbis say: All families retain presumptive status of fitness. Rav Ḥama bar Gurya says that Rav says: When an objection is registered about a family concerning its lineage, everyone agrees that he must investigate it. According to this version, there is no contradiction between these two complementary statements.