1 Samuel 20:29-33

He said, ‘Please let me go, because our family has a sacrifice in the city, and my brother has ordered me to attend. So now, if I have found favor in your sight, please let me slip away so that I may see my brothers.’ For this reason he has not come to the king’s table.” Saul Is Angry with Jonathan

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.