Summa Theologiae: Baptism

Third Part, Question 66, Articles 2, 3, 5 & 6;

Article 2: Whether Baptism Was Instituted After Christ's Passion;

Article 3: Whether Water is the Proper Matter of Baptism;

Article 5: Whether the Formula of Baptism Is Fitting;

Article 6: Whether Baptism Can Be Conferred in the Name of Christ