(Matthew
28:19-20) ". . .Go therefore and make disciples of people of all the nations, baptizing them in the name of the Father and of the Son and of the holy spirit, 20 teaching them to observe all the things I have commanded YOU.. . ."So nope, where doesn't matter, just as long as it is in the name of the Father and of the Son and of the Holy Spirit.
You can technically get dunked by anyone, even in your own bathtub.
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