Acts 20:28-31

20:28 Watch 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. 20:29 I know that after I am gone fierce wolves will come in among you, not sparing the flock. 20:30 Even from among your own group men will arise, teaching perversions of the truth to draw the disciples away after them. 20:31 Therefore be alert, remembering that night and day for three years I did not stop warning each one of you with tears.