1 Samuel 20:7, 9, 33

If he says, ‘Very well,’ then your servant is safe. But if he loses his temper, you can be sure that he is determined to harm me.

“Never!” Jonathan said. “If I had the least inkling that my father was determined to harm you, wouldn’t I tell you?”

But Saul hurled his spear at him to kill him. Then Jonathan knew that his father intended to kill David.