Books Used in the Liturgy - Lectionary

Lectionary – From the Latin lectio, meaning to read. 

The Sunday lectionary is divided into three cycles that correspond to the first three Gospels:

A/Matthew

B/Mark

C/Luke

There is no separate cycle that includes John’s Gospel because that Gospel is so different from the other three. However, John’s Gospel is used to supplement the Gospel of Mark during Cycle B. John’s Gospel is also used for the third, fourth and fifth Sundays of Lent as part of the Scrutiny Rites for the catechumens. John’s account of the passion is always proclaimed on Good Friday. A new lectionary cycle begins every year on the first Sunday of Advent