Rabban Gamliel the Elder

Upon hearing that Rabbi Joshua had challenged his ruling, Rabban Gamliel sent a message to him: I decree against you that youappear before me with your staff and with your money on the day on which Yom Kippur occurs according to your calculation.

Rabbi Akiva went and found Rabbi Joshua distressed.

Rabbi Akiva said to Rabbi Joshua: I can learn from a verse that everything that Rabban Gamliel did in sanctifying the month is valid. As it is stated: “These are the appointed seasons of the Holy One, sacred gatherings, which you shall proclaim in their season” (Leviticus 23:4). This verse indicates that whether you have proclaimed them at their proper time or whether you have declared them not at their proper time, I have only these Festivals as established by the representatives of the Jewish people.

Rabbi Joshua then came to Rabbi Dosa ben Horkinas, who said to him: If we come to debate and question the rulings of the court of Rabban Gamliel, we must debate and question the rulings of every court that has stood from the days of Moses until now. As it is stated: “Then Moses went up, and Aaron, Nadav and Avihu, and seventy of the Elders of Israel” (Exodus 24:9). But why were the names of these seventy Elders not specified? Rather, this comes to teach that every set of three judges that stands as a court over the Jewish people has the same status as the court of Moses.

Afterwards, [Rabbi Joshua] took his staff and his money in his hand, and went to Yavne to Rabban Gamliel on the day on which Yom Kippur occurred according to his own calculation. Upon seeing him, Rabban Gamliel stood up and kissed him on his head. He said to him: Come in peace, my teacher and my student. You are my teacher in wisdom, as Rabbi Yehoshua was wiser than anyone else in his generation, and you are my student, as you accepted my statement, despite your disagreement.