1 Samuel 20:30-33

Saul’s anger flared up at Jonathan and he said to him, “You son of a perverse and rebellious woman! Don’t I know that you have sided with the son of Jesse to your own shame and to the shame of the mother who bore you? As long as the son of Jesse lives on this earth, neither you nor your kingdom will be established. Now send someone to bring him to me, for he must die!” “Why should he be put to death? What has he done?” Jonathan asked his father. But Saul hurled his spear at him to kill him. Then Jonathan knew that his father intended to kill David.