Acts of the Apostles 20:28-31

Watch yourselves and the whole flock, in which the Holy Spirit has placed you as supervisors, to shepherd God’s church, which he obtained with the death of his own Son. I know that, after my departure, savage wolves will come in among you and won’t spare the flock. Some of your own people will distort the word in order to lure followers after them. Stay alert! Remember that for three years I constantly and tearfully warned each one of you. I never stopped warning you!