אֵ֚לֶּה מוֹעֲדֵ֣י יְהוָ֔ה מִקְרָאֵ֖י קֹ֑דֶשׁ אֲשֶׁר־תִּקְרְא֥וּ אֹתָ֖ם בְּמוֹעֲדָֽם׃
"Estas são as festas fixas de Hashem, santas convocações, que vós proclamareis nas suas épocas designadas:
Mishnah Rosh Hashanah
If one who has seen the new moon and is not able to walk [to Jerusalem] on foot, he may be brought on a donkey or even in a litter [on Shabbat]. If they [the witnesses] are likely to be attacked, they may take sticks [to defend themselves]. If the distance is great [to Jerusalem], they may take provisions with them, since for as much as a night and a day’s journey they were allowed to profane Shabbat and go out to testify concerning the new moon, as it says: “These are the appointed times of the Lord … which you shall proclaim at their appointed time” (Leviticus 23:4).
Mishnah Rosh Hashanah
Rabban Gamaliel sent to him: I order you to appear before me with your staff and your money on the day which according to your count should be Yom Hakippurim. Rabbi Akiva went and found him in distress. He said to him: I can teach that whatever Rabban Gamaliel has done is valid, because it says, “These are the appointed seasons of the Lord, holy convocations, which you shall proclaim at their appointed times” (Leviticus 23:4), whether they are [proclaimed] at their proper time or not at their proper time, I have no other appointed times save these. He [Rabbi Joshua] then went to Rabbi Dosa ben Harkinas. He said to him: if we call in question the court of Rabban Gamaliel we must call in question the decisions of every court which has existed since the days of Moses until now. As it says, “Then Moses and Aaron, Nadav and Avihu and seventy of the elders of Israel went up” (Exodus 24:9). Why were the names of the elders not mentioned? To teach that every group of three which has acted as a court over Israel, behold it is like the court of Moses. He [Rabbi Joshua] took his staff and his money and went to Yavneh to Rabban Gamaliel on the day which according to his count should be Yom Hakippurim. Rabban Gamaliel rose and kissed him on his head and said to him: Come in peace, my teacher and my student my teacher in wisdom and my student because you have accepted my decision.
Mishnah Megillah
On Pesah we read from the portion of the festivals in Leviticus (Torat Kohanim) (Leviticus 23:4). On Shavuot, “Seven weeks” (Deuteronomy 16:9). On Rosh Hashanah “On the seventh day on the first of the month” (Leviticus 23:2. On Yom Hakippurim, “After the death” (Leviticus. On the first day of the Festival [of Sukkot] they read from the portion of the festivals in Leviticus, and on the other days of the Festival [of Sukkot] the [sections] on the offerings of the Festival.