1 Samuel 20:7, 9, 33

If he says, ‘Fine!’ you will know all is well. But if he is angry and loses his temper, you will know he is determined to kill me.

“Never!” Jonathan exclaimed. “You know that if I had the slightest notion my father was planning to kill you, I would tell you at once.”

Then Saul hurled his spear at Jonathan, intending to kill him. So at last Jonathan realized that his father was really determined to kill David.