And he charged them, saying, Take heed, beware of the leaven of the Pharisees, and of the leaven of Herod.
Mark 8:15
Twice in Deuteronomy (Deuteronomy 4:2; 12:32), Moses commanded the people to neither add to, nor take away from what He had said. There is always the trend among religious folk to do this, as it was then, so it is today, amongst men.