출애굽기 19:1 할라카: Mishneh Torah, Prayer and the Priestly Blessing & Tur

On Pentecost, the section from the Pentateuch is that beginning, "Seven weeks" (Deuteronomy 16:9-17). But the general custom is to read on the first day of the feast the section beginning, "In the third month" (Exodus 19:1-20:26). And the lesson from the Prophets is "The vision of the Chariots" (Ezekiel 1:1-28). On the second day the section read is that concerning the Festivals, beginning, "All the firstling males" (Deuteronomy 15:19-16:17) and the lesson from the Prophets is taken from Habakuk (3:1-end).

The holiday of Shavuot is on the fiftieth day of the counting of the Omer. The order of prayer is like that on the holiday of Passover, except that we say, "this festival day of Shavuot, the time of the giving of our Torah." And in the additional service (musaf), we mention the additional sacrifices [of this holiday], "And on the Day of the First Fruits," until, "and two daily sacrifices according to their law." And we recite the complete Hallel and take out two [Torah] scrolls: On the first day, five people read in Parshat Yitro [beginning] from, "In the third month" (Exodus 19:1), until the end of the [parsha]. And the one who concludes reads [beginning from], "And on the Day of the First Fruits" (Numbers 28:26); and he concludes with the chariot of Ezekiel, ending [that reading] with the verse, "Then a spirit lifted me up" (Ezekiel 3:12). And on the second day, we read the section [that begins with], "Every firstborn" (Deuteronomy 15:19), to the end of the section; and the one who concludes reads the same as [that which was read] the previous day, but he concludes with Habakkuk, [beginning] from, "But the Lord in His holy Abode" (Habakkuk 2:20), until, "for the leader; with instrumental music" (Habakkuk 3:19). And we have the practice in all places to say the Azharot, which is based on the sum total of the [Torah's] commandments, during the additional service after the repetition of the [standing amidah] prayer. But every place does what is in accordance with its custom.