Anima Christi
The author is unknown, but the prayer was already circulating in the early 14th century, and Pope John XXII granted it an indulgence. St. Ignatius of Loyola put it at the front of the Spiritual Exercises, which is why it is often mistaken for his. Each line names something of Christ, his body, his blood, his wounds, and asks it to do one thing for the person praying.
Anonymous, early 14th century
Soul of Christ, sanctify me.
Body of Christ, save me.
Blood of Christ, inebriate me.
Water from the side of Christ, wash me.
Passion of Christ, strengthen me.
O good Jesus, hear me.
Within thy wounds hide me.
Suffer me not to be separated from thee.
From the malignant enemy defend me.
In the hour of my death call me.
And bid me come unto thee,
that with thy saints I may praise thee
for ever and ever.
Amen.