Jesus’ letter to the church in Smyrna in Revelation 2:8-11 tells them they will be persecuted for following Him. But that they can persevere and keep their eyes on Him and the eternal reward of Heaven.
In the second and third chapters of the Book of Revelation, we read letters that Jesus wrote to seven churches in Asia (modern day Turkey). In the letter to Ephesus, He told them they were doing many good things but had forgotten the most important thing – their love for Him.