Acts 18:21

21 but bade them farewell, saying, [I must by all means keep the coming feast at Jerusalem]; I will return to you again, if God will: and he sailed away from Ephesus.

Acts 18:21 In-Context

19 and he arrived at Ephesus, and left them there. But entering himself into the synagogue he reasoned with the Jews.
20 And when they asked him that he would remain for a longer time [with them] he did not accede,
21 but bade them farewell, saying, [I must by all means keep the coming feast at Jerusalem]; I will return to you again, if God will: and he sailed away from Ephesus.
22 And landing at Caesarea, and having gone up and saluted the assembly, he went down to Antioch.
23 And having stayed [there] some time, he went forth, passing in order through the country of Galatia and Phrygia, establishing all the disciples.
The Darby Translation is in the public domain.