Trisagion — Holy God, Holy Mighty, Holy Immortal

An ancient hymn of adoration to the Most Holy Trinity from the Byzantine Liturgy, sung three times (in Greek, tris-hagion means thrice holy). Traditionally attributed to the liturgy of Constantinople of the 5th c.; present in the Small Entrance of the Divine Liturgy of St John Chrysostom (Byzantine Catholic rite) and, in the Roman rite, in the Adoration of the Cross on Good Friday, among the Improperia, alternately in Greek and Latin — a most ancient sign of the unity of the Church between East and West.

Holy God, Holy Mighty One, Holy Immortal One,
have mercy on us.

(said three times)

Glory be to the Father, and to the Son, and to the Holy Spirit, as it was in the beginning, is now, and ever shall be, world without end. Amen.

All-holy Trinity, have mercy on us. Lord, cleanse us from our sins. Master, pardon our iniquities. Holy One, visit and heal our infirmities, for thy Name’s sake. Lord, have mercy; Lord, have mercy; Lord, have mercy.