Conditional Baptism

From the Book of Divine Worship - Holy baptism.

If there is reasonable doubt that a person has been baptized with water, "In the Name of the Father, and of the Son, and of the Holy Spirit" (which are the essential parts of Baptism), the person is baptized in the usual manner, but this form of words is used:

If you are not already baptized, , I baptize you in the Name of the Father, and of the Son, and of the Holy Spirit.