1 Samuel 20:30-34

Then Saul’s anger burned against Jonathan, and he said to him, “You son of a perverse, rebellious woman! Do I not know that you are choosing 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, neither you nor your kingdom will be established. Now then, send men and bring him to me, for he is doomed to die!”

But Jonathan replied to his father Saul and said to him, “Why must he be put to death? What has he done?”

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

Then Jonathan got up from the table in the heat of anger, and did not eat food on the second day of the new moon, because he was worried about David since his father had insulted him.