Acts 18:8-11 

8 Then Crispus, the ruler of the synagogue, believed on the Lord with all his household. And many of the Corinthians, hearing, believed and were baptized.
9 Now the Lord spoke to Paul in the night by a vision, “Do not be afraid, but speak, and do not keep silent; 10 for I am with you, and no one will attack you to hurt you; for I have many people in this city.”
11 And he continued there a year and six months, teaching the word of God among them.