'Take Heed' in the Bible

And he said unto them, "Shall it be so? The LORD be with you! Should I let you go, and your children also? Take heed, for ye have some mischief in hand.

And Pharaoh said unto him, "Get thee from me and take heed to thyself that thou see my face no more. For whensoever thou comest in my sight, thou shalt die."

Take heed to thyself, that thou make no covenant with the inhabiters of the land whither thou goest lest it be cause of ruin among you.