1 Samuel 20:24-26

So David hid in the field, and when the New Moon feast came, the king sat down to eat. He sat in his customary place by the wall, opposite Jonathan, and Abner sat next to Saul, but David’s place was empty. Saul said nothing that day, for he thought, “Something must have happened to David to make him ceremonially unclean—surely he is unclean.”