Introduction to the Lectionary
Opening page of John, Jaharis Byzantine Lectionary, 1100 AD, Metropolitan Museum of Art, public domain wikipedia.org
Link to more photographs from this lectionary:
Photo of a page from a Talmud (1000 AD?) from the Cairo Genizah, Egypt.
The Mishnah states: The verse “And Moses declared to the children of Israel the appointed seasons of the Lord” (Leviticus 23:44) indicates that part of the mitzva of the Festivals is that they should read the portion relating to them, each one in its appointed time. The Sages taught in a baraita: Moses enacted for the Jewish people that they should make halakhic inquiries and expound upon the matter of the day. They should occupy themselves with the halakhot of Passover on Passover, with the halakhot of Shavuot on Shavuot, and with the halakhot of Sukkot on Sukkot.
Talmud, Megilah 32a
1 Raczka, Gary Philippe. "The Lectionary at the Time of Saint John Chrysostom." Notre Dame, 2015.