1 Samuel 20:7, 9, 33

If he says, ‘Good!’ it will be well with your servant, but if he is angry, then know that harm is determined by him.

And Jonathan said, “Far be it from you! If I knew that it was determined by my father that harm should come to you, would I not tell you?”

But Saul hurled his spear at him to strike him. So Jonathan knew that his father was determined to put David to death.