Acts 20:28-30

28Take care and be on guard for yourselves and for the whole flock over which the Holy Spirit has appointed you as overseers, to shepherd (tend, feed, guide) the church of God which He bought with His own blood.

29I know that after I am gone, [false teachers like] ferocious wolves will come in among you, not sparing the flock;

30even from among your own selves men will arise, speaking perverse and distorted things, to draw away the disciples after themselves [as their followers].