There is a pious custom in the Catholic Church of offering a brief interior prayer at the moment when the priest elevates the consecrated host at Mass.
It is at that moment when the Eucharistic host, through the power of God, becomes the body, blood, soul and divinity of Jesus Christ.
Here is a list of some of the more common prayers said at that moment to emphasize the profound and miraculous event that is happening before our eyes.
Blessed and praised every moment
Be the most holy and divine Sacrament!
My Lord and my God!
O Sacrament most holy! O Sacrament divine!
All praise and all thanksgiving be every moment Thine.