Matthew 28:19 does not teach a Trinity formula.
The Greek phrase εἰς τὸ ὄνομα never means ‘recite these words.’
It always means into/for the purpose of — like John’s baptism into repentance (Matt 3:11) and Peter’s baptism into forgiveness (Acts 2:38).
A ‘name’ in Scripture means character, not ‘person’ — God’s Name is ‘merciful and gracious’ (Exod 34:6).
Father, Son, and Spirit share the same Name because they share the same mercy.
And the proof is simple:
Every actual NT baptism after this verse is done in Jesus’ name alone.
If Jesus gave a formula, the apostles disobeyed Him.
If He gave a purpose, they fulfilled it.
So Matthew 28:19 is a call to immerse people into divine mercy, not into a metaphysical doctrine.”