Yet truly, he said, "Then with what have you been baptized?" And they said, "With the baptism of John.
Other versions
King James Version
And he said unto them, Unto what then were ye baptized? And they said, Unto John's baptism.English Standard Version
And he said, "Into what then were you baptized?" They said, "Into John's baptism."New International Version
So Paul asked, "Then what baptism did you receive?John's baptism," they replied.