Acts 20:28-30

28Watch out for yourselves and for all the flock of which the Holy Spirit has made you overseers, to shepherd the church of God that he obtained with the blood of his own Son.

29I know that after I am gone fierce wolves will come in among you, not sparing the flock.

30Even from among your own group men will arise, teaching perversions of the truth to draw the disciples away after them.