These three prayers to the Holy Ghost, originally special to the feast of Pentecost, are treasures of the Byzantine Rite. The first troparion is sung as part of the customary devotions at the start of any liturgical act or prayer; the second troparion is sung at Communion at almost every Divine Liturgy (its reference to Trinitarian worship reflects the Eastern emphasis on Pentecost as the complete revelation of the Trinity with the coming of the promised Paraclete); the third is the special refrain for the second antiphon at the Liturgy on the feast itself.
Heavenly King, Paraclete, Spirit of Truth, present everywhere, filling all things, Treasury of blessings and Giver of life; come and dwell in us, cleanse us from every stain, and, O Good One, save our souls.
We have seen the true light, we have received the heavenly Spirit, we have found the true faith, as we worship the undivided Trinity, for the same has saved us.
Good Paraclete, save us who sing to you: Alleluia.