The Divine Liturgies Of Our Fathers by Saint John Chrysostom
If there happen a notable feasted Saint on a day of the fast; if it be the Fourth-day, in the Liturgy of the Presanctified there is sung the Idiomelon of the day twice, the Martyrikon once, the three Prosomoia of the series of the Triodion, and the four of the feasted Saint (not of the Saint of the coming day). Glory; of the Saint; Both now; a Theotokion of the same Tone as the Doxastikon. After: Let my prayer be directed, there is said the Apostle and Gospel of the feasted Saint. The Koinonikon is In eternal remembrance. But if it be the Paraskevê, there is sung the Idiomelon of the day twice, the four Martyrika of the Tone, and the four of the feasted’ Saint. Glory; of the Saint; Both now; the first Theotokion of the Tone, etc.