'Take Heed' in the Bible

And Pharaoh said unto him, Get you from me, take heed to yourself, see my face no more; for in that day you see my face you shall die.

And you shall set bounds unto the people round about, saying, Take heed to yourselves, that you go not up into the mount, or touch the border of it: whosoever touches the mount shall be surely put to death:

Take heed to yourself, lest you make a covenant with the inhabitants of the land where you go, lest it be for a snare in the midst of you: