A Hidden Reference to the Trinitarian Formula

I recently met a nice fella at the park who was from a Oneness Pentacostal congregation.  After some smalltalk he began telling me I had been baptized improperly.

I had been baptized in the name of the Father, Son, and Holy Spirit - also known as the Trinitarian formula.  He insisted I needed to be baptized in the name of Jesus Christ only.

Today I want to explore why he was saying this.  Then we will look at the witness of the Early Church on the matter, and finally look at a little-known piece of Scriptural evidence for the Trinitarian words of baptism.