What is the outward and visible sign in Baptism? (Q105)
From To Be A Christian, An Anglican Catechism
The outward and visible sign is water, in which candidates are baptized “In the name of the Father, and of the Son, and of the Holy Spirit” – the name of the Triune God to whom the candidate is being committed. (1662 Catechism, 1 Peter 3:21; Matthew 28:19)