Watch what you listen to

Then understood they how that he bade them not beware of the leaven of the bread, but of the doctrine pf the Pharisess and of the Sadducees.

Matthew 16: 12

Jesus was using a parable of leaven bread to explain to the disciples to not take in everything that people tell you. Especially people inn religious statue. If they are not saying what the bible says you need to be mindful of their words and be cautions towards their message. That is why you must always  stay in your bible. So you can know that what is preach to be the truth and not an agenda. Stay in your bible. Stay in the word of God