'Take Heed' in the Bible

But take heed that ye do not your righteousness before men, to be seen by them; otherwise ye have no reward with your Father who is in heaven.

And Jesus said to them, Take heed, and beware of the leaven of the Pharisees and Sadducees.

Take heed that ye despise not one of these little ones; for I say to you, that their angels in heaven continually behold the face of my Father who is in heaven.