"to go to the region of Achaia." The phrase "pass over" is used here because Apollos had to cross the Aegean Sea to get to Achaia from Ephesus.
# brothers
The word "brothers" here refers to men and women believers. You can make explicit that these are believers in Ephesus. AT: "fellow believers in Ephesus" (See: [[rc://en/ta/man/translate/figs-gendernotations]] and [[rc://en/ta/man/translate/figs-explicit]])