'Take Heed' in the Bible

But Jonathan Saul's son delighted much in David: and Jonathan told David, saying, Saul my father seeketh to kill thee: now therefore, I pray thee, take heed to thyself until the morning, and abide in a secret place, and hide thyself:

Now take heed and see what thou hast to do, for it is concluded to do mischief unto our master and to all his household. And he is ungracious to speak to."