Acts 20:28-30

²⁸Be on guard for yourselves and for all the flock, among which the Holy Spirit has made you overseers, to shepherd the church of God which He purchased with His own blood. ²⁹I know that after my departure savage wolves will come in among you, not sparing the flock; ³⁰and from among your own selves men will arise, speaking perverse things, to draw away the disciples after them.