Hebrews 13:9.The Bible warns us to not be influenced by strange doctrines so be very familiar with Scripture.

9 Do not be carried away by varied and strange teachings;

During the time that this was written there were immature Christians trying to mix OT practices into their daily worship.
Ceremonial foods as necessary to approach God

Today we know that as foolishness

Today's dangers
Cults that distort truth to enslave the naïve
Popular preachers that line their pockets, direct or indirectly, that they live lives of wealth

You, Christian, stay fixed on Jesus as the focus of your daily life