'Take Heed' in the Bible

And Abraham saith unto him, 'Take heed to thyself, lest thou cause my son to turn back thither;

And God came to Laban the Syrian in a dream by night, and said unto him, Take heed that thou speak not to Jacob either good or bad.

It is in the power of my hand to do you hurt: but the God of your father spake unto me yesternight, saying, Take heed to thyself that thou speak not to Jacob either good or bad.