Pentecostarion
![Icon of the Fifth Sunday of Pascha, commemorating the Samaritan woman (Photina), meeting Jesus by the well. Note that the well is cross-shaped; most of the Sundays of the Pentecostarion deal with the subject of water, a reference to Baptism.](/Images/godic/202502/02/St_Photina4322.jpg")
The Pentecostarion (Greek: Πεντηκοστάριον, Pentekostárion; Slavonic: Цвѣтнаѧ Трїωдь, Tsvyetnaya Triod' , literally "Flowery Triodon"; Romanian:Penticostar) is the liturgical book used by the Eastern Orthodox and Eastern Catholic Churches which follow the Byzantine Rite during the Paschal Season which extends from Pascha (Easter) to the Sunday following All Saints Sunday (i.e., the Second Sunday After Pentecost).