The disciples of Ephesus did not even know that there was a what?

ANSWER

Holy Ghost

Acts 19 :

(1) While Apollos was at Corinth, Paul took the road through the interior and arrived at Ephesus. There he found some disciples (2) and asked them, “Did you receive the Holy Spirit when you believed?”

They answered, “No, we have not even heard that there is a Holy Spirit.”

(3) So Paul asked, “Then what baptism did you receive?”

“John’s baptism,” they replied.
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