angelic trisagion

The Holy Trinity is the central mystery of our faith. The feast of the Holy Trinity, which is celebrated on the Sunday after Pentecost, was established for the whole Western Church in 1134 by Pope John XII. The Angelic Trisagion is said for the three days prior to Trinity Sunday.

In the name of the Father, and of the Son, and of the Holy Spirit. Amen.

℣. Lord, open my lips.

℟. And my mouth shall declare your praise.

℣. O God, come to my assistance.

℟. O Lord, make haste to help me.

℣. Glory be . . .

℟. As it was . . .