Divine Liturgy of St. John Chrysostom
While the people sing a hymn of thanksgiving and supplication, the priest prays the epiclesis. God the Father is invoked to send down the Holy Spirit in order to, according to the Divine Liturgy of St. John Chrysostom, "...make this bread the precious Body of thy Christ... And that which is in this cup the precious Blood of thy Christ... Changing them by thy Holy Spirit." This is the most solemn point of the anaphora, as it is from that point on the bread and wine are considered to be the literal body and blood of Christ and not from the Words of Institution as in some other traditions.