Revelation 2:4-5

But I have this [one charge to make] against you: that you have left (abandoned) the love that you had at first [you have deserted Me, your first love]. Remember then from what heights you have fallen. Repent (change the inner man to meet God's will) and do the works you did previously [when first you knew the Lord], or else I will visit you and remove your lampstand from its place, unless you change your mind and repent.