This particular prayer is used to replace the “Glory Be” during Holy Week
The “Glory Be” is a prayer usually said after praying each decade of the Rosary. It is the common way to pray the Rosary and has been the custom for many centuries.
Meanwhile, during Holy Week, and in some places beginning from the 5th Sunday of Lent, the following prayer will be prayed in the place of “Glory be”. This prayer highlights the Passion and death of Jesus and is meant to help Catholics have more meditation on the suffering of Jesus.
V. Christ was obedient for us unto death.
R. Even to death on a cross.
These two verses came straight from St. Paul’s letter to the Philippians, (Philippians 2:8) “he humbled himself, becoming obedient to death, even death on a cross”.
Though, it’s not a mandatory custom, but it reflects the somber mood of Holy Week and is in line with likely practices in the Church, such as omitting the Gloria or Alleluia during Lent.
For people looking for a new way to enter into the Passion of Jesus, try to replace :the Glory Be” with this prayer this Holy week.