Saul spake to Jonathan his son, and to all his servants, that they should kill David. 1 Samuel 19:1
But Jonathan "delighted much in David" and talked his dad out of it.
But Jonathan Saul's son delighted much in David … And Jonathan spake good of David unto Saul his father, and said unto him, Let not the king sin against his servant, against David. 19.2-4So Saul swears he won't kill David.
Saul hearkened unto the voice of Jonathan: and Saul sware, As the LORD liveth, he shall not be slain. 19.6Then David went out and slaughters some more Philistines.
David went out, and fought with the Philistines, and slew them with a great slaughter. 19:8After David returned from the “great slaughter,” the evil spirit from the Lord came upon Saul again, while he sat in his house with his javelin and David played with his hand.
And the evil spirit from the LORD was upon Saul, as he sat in his house with his javelin in his hand: and David played with his hand. 19.9Saul threw his javelin at David again, but shucks, he missed again!
Saul sought to smite David even to the wall with the javelin: but he slipped away out of Saul's presence, and he smote the javelin into the wall: and David fled, and escaped that night. 19.10(I guessed that 10,000 Philistines died in this “great slaughter.”)