1 Samuel 20:23-27

As for the agreement of which you and I have spoken, behold, the Lord is between you and me forever.”

So David hid himself in the field; and when the new moon came, the king sat down to eat food.

Now the king sat on his seat as usual, the seat by the wall; then Jonathan stood up and Abner sat down by Saul’s side; but David’s place was empty.

Nevertheless Saul did not say anything that day, because he thought, “It must have been an accident; he is not clean, undoubtedly he is not clean.”

But it came about the next day, the second day of the new moon, that David’s place was empty again; so Saul said to his son Jonathan, “Why has the son of Jesse not come to the meal, either yesterday or today?”