Not for David. King Saul was seeking to kill David, and when he had the chance to take king Saul out, he did not. Please read 1 Samuel 22 through 24.

And David said to Saul, “Wherefore hearest thou men’s words, saying, ‘Behold, David seeketh thy hurt?’  Behold, this day thine eyes have seen how that the LORD had delivered thee to day into mine hand in the cave: and some bade me kill thee: but mine eye spared thee; and I said, ‘I will not put forth mine hand against my lord; for he is the LORD’S anointed.’  Moreover, my father, see, yea, see the skirt of thy robe in my hand: for in that I cut off the skirt of thy robe, and killed thee not, know thou and see that there is neither evil nor transgression in mine hand, and I have not sinned against thee; yet thou huntest my soul to take it. The LORD judge between me and thee, and the LORD avenge me of thee: but mine hand shall not be upon thee.  As saith the proverb of the ancients, ‘Wickedness proceedeth from the wicked:’ but mine hand shall not be upon thee.  After whom is the king of Israel come out? After whom dost thou pursue? After a dead dog, after a flea? The LORD therefore be judge, and judge between me and thee, and see, and plead my cause, and deliver me out of thine hand.”
1 Samuel 24:9-15