Revelation 3:
Luke 12:
See How not to be lukewarm.
Jesus addressed the nominal Christians. It was a warning. Take heed. Get serious. The context points to the Church in Sardis (Revelation 3:1). I do not have an operational definition of lukewarm. I leave it to the conscience of the individual believers to decide for themselves whether he is a lukewarm Christian or not.16 So, because you are lukewarm—neither hot nor cold—I am about to spit you out of my mouth.
Luke 12:
That's one kind of lukewarm Christian.47“The servant who knows the master’s will and does not get ready or does not do what the master wants will be beaten with many blows.
That's another.48 But the one who does not know and does things deserving punishment will be beaten with few blows.
Lukewarm Christians will be punished, some more and some less. Get busy and active in the will of God.From everyone who has been given much, much will be demanded; and from the one who has been entrusted with much, much more will be asked.
See How not to be lukewarm.