NO REBAPTISMS IN ACTS 18:24 THROUGH 19:7
[Excerpt from “Rebaptism Impossible!” (S.T.D.), pp. 32-43:]
Apollos was never rebaptized. He was mighty in the Scriptures and knew much about the baptism of John — even before his arrival in Ephesus. We are told he there received further instruction in the Christian way85 — yet without rebaptism! For we are never told he was ever rebaptized — either there, or elsewhere. See my other article: ‘The Baptism of John’ and the fiery believer Apollos.
Yet water-washed unitarians still needed Christian baptism!
On the other hand, non-trinitarian washings (whether by immersion or by sprinkling) were never regarded — by the Apostolic Church — as Christian baptisms. Hence, those previously immersed or sprinkled non-trinitarianly — but then converted to the Triune God — still needed to receive their one-and-only trinitarian baptism.