Acts 20:28-31

So guard your hearts. Be true shepherds over all the flock and feed them well. Remember, it was the Holy Spirit who appointed you to guard and oversee the churches that belong to Jesus, the Anointed One, which he purchased and established by his own blood. “I know that after I leave, imposters who have no loyalty to the flock will come among you like savage wolves. Even some from among your very own ranks will rise up, twisting the truth to seduce people into following them instead of Jesus. So be alert and discerning. Remember that for three years, night and day, I’ve never stopped warning each of you, pouring out my heart to you with tears.