Shavuot I / שָׁבוּעוֹת יוֹם א׳
Torah Portion: Exodus 19:1-20:23; Numbers 28:26-28:31
This Torah reading for the first day of Shavuot recaps Hashem giving Moshe Rabbeinu the Ten Commandments. The Children of Israel proclaimed, "We will do and we will hear". They committed to the covenant with G-d even before hearing the terms.
The people were told to get ready for the revelation. Aaron and the elders stood at the foot of Mount Sinai while Joshua followed Moses up the mountain and maintained vigilance halfway up. Moses then continued up to top.
He remained there for forty days and nights and received the first of Hashem's Law. In this discussion of the Ten Commandments, the fifth commandment is stated to "remember" the Shabbat, as differentiated from the repetition in Deuteronomy to "guard" or "keep" the Shabbat.
Shavuot II / שָׁבוּעוֹת יוֹם ב׳
Torah Portion: Deuteronomy 15:19-16:17; Numbers 28:26-28:31
This portion first talks about the consecration of the first born. This ties in with Shavuot since this holiday is the beginning of the first fruits of the harvest.
The portion then discusses the three pilgrimage festivals of Passover, Shavuot and Succot.
The maftir for both days (Numbers 28:26-28:31) discusses the offerings for Shavuot. This is two bulls of the herd, one ram and seven yearling lambs along with a meal offering.