Those churches (Eastern Orthodox and Byzantine Catholic) which follow the Rite of Constantinople, provide an epistle and Gospel reading for most days of the year, to be read at the Divine Liturgy; however, during Great Lent there is no celebration of the liturgy on weekdays (Monday through Friday), so no epistle and Gospel are appointed for those days. As a historical note, the Greek lectionaries are a primary source for the Byzantine text-type used in the scholarly field of textual criticism.