Tantum ergo are the opening words of the last two verses of Pange Lingua, a Mediaeval Latin hymn written by St Thomas Aquinas. These last two verses are sung during veneration and Benediction of the Blessed Sacrament in the Roman Catholic Church and other churches that practice this devotion. It is usually sung, though solemn recitation is sometimes done, and permitted.
Some part of the consecration:
Priest: Panem de caelis praestitisti eis. (All: Alleluja)
Response: Omne delectamentum in se habentem.(All: Alleluja)
Oremus: Deus, qui nobis sub sacramento mirabili, passionis tuae memoriam reliquisti: tribue, quaesumus, ita nos corporis et sanguinis tui sacra mysteria venerari, ut redemptionis tuae fructum in nobis iugiter sentiamus. Qui vivis et regnas in saecula saeculorum.
R. Amen.
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