I Samuel 20:30-33

Then Saul’s anger was aroused against Jonathan, and he said to him, “You son of a perverse, rebellious woman! Do I not know that you have chosen the son of Jesse to your own shame and to the shame of your mother’s nakedness? For as long as the son of Jesse lives on the earth, you shall not be established, nor your kingdom. Now therefore, send and bring him to me, for he shall surely die.” And Jonathan answered Saul his father, and said to him, “Why should he be killed? What has he done?” Then Saul cast a spear at him to kill him, by which Jonathan knew that it was determined by his father to kill David.