Revelation 2:1–7 is the first letter Jesus dictated to John, intended for the church at Ephesus. This congregation is praised for patient endurance and for rightly rejecting false apostles. Despite such an excellent beginning, however, Ephesus had abandoned its first love. They were drifting into coldness and rote religiosity. Jesus instructs the church to remember its early days, repent, and conduct itself as it had done initially. He promises a reward to the victor.
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“Revelation 2:4-5” Bibleref.com
4 But I have this against you, that you left your first love. 5 Remember therefore from where you have fallen, and repent and do the first works; or else I am coming to you swiftly, and will move your lamp stand out of its place, unless you repent.