Acts 20:29-30

29 I know that after I have gone, savage wolves will come in among you, not sparing the flock.
30 Some even from your own group will come distorting the truth in order to entice the disciples to follow them.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.