1 Samuel 20:7, 9, 33

If he says, ‘It is good,’ your servant will be safe; but if he is very angry, know that he has decided on evil.

Jonathan said, “Far be it from you! For if I should indeed learn that evil has been decided by my father to come upon you, then would I not tell you about it?”

Then Saul hurled his spear at him to strike him down; so Jonathan knew that his father had decided to put David to death.