Tractate Yevamot - Chapter 16 - Mishnah 7 יבמות פרק ט״ז משנה ז׳

Rabbi Akiva said: When I went down to Nehardea to intercalate the year, I met Nehemiah of Bet D’li who said to me, “I heard that in the land of Israel no one, permits a [married] woman to marry again on the evidence of one witness, except Rabbi Judah ben Bava”. “That is so”, I told him. He said to me, “Tell them in my name: ‘You know that this country is in confusion because of marauders. I have received a tradition from Rabban Gamaliel the Elder: that they allow a [married] woman to remarry on the evidence of one witness’”. And when I came and recounted the conversation in the presence of Rabban Gamaliel he rejoiced at my words and exclaimed, “We have found a match for Rabbi Judah ben Bava!” As a result of this talk Rabban Gamaliel remembered that some men were once killed at Tel Arza, and that Rabban Gamaliel the Elder had allowed their wives to marry again on the evidence of one witness, and the law was established that they allow a woman to marry again on the evidence of one witness, and on the testimony of one [who states that he has heard] from another witness, from a slave, from a woman or from a female slave. Rabbi Eliezer and Rabbi Joshua say: a woman is not be allowed to remarry on the evidence of one witness. Rabbi Akiva ruled: [a woman is not allowed to marry again] on the evidence of a woman, on that of a slave, on that of a female slave or on that of relatives. They said to him: It once happened that a number of Levites went to Tsoar, the city of palms, and one of them became ill on the way, and they left him in an inn. When they returned they asked the [female] innkeeper, “Where is our friend?” And she replied, “He is dead and I buried him”, and they allowed his wife to remarry. Should not then a priest’s wife [be believed at least as much] as an innkeeper!” He answered them: When she will [give such evidence] as the innkeeper [gave] she will be believed, for the innkeeper had brought out to them [the dead man’s] staff, his bag and the Torah scroll which he had with him.