Acts 20:28-30

28Keep watch over yourselves and all the flock of which the Holy Spirit has made you overseers. Be shepherds of the church of God, Many manuscripts of the Lord which he bought with his own blood. Or with the blood of his own Son. 29I know that after I leave, savage wolves will come in among you and will not spare the flock. 30Even from your own number men will arise and distort the truth in order to draw away disciples after them.