I Samuel 20:7, 9, 33

If he says thus: ‘It is well,’ your servant will be safe. But if he is very angry, be sure that evil is determined by him.

But Jonathan said, “Far be it from you! For if I knew certainly that evil was determined by my father to come upon you, then would I not tell you?”

Then Saul cast a spear at him to kill him, by which Jonathan knew that it was determined by his father to kill David.