1 Samuel 20:24-28

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?”

And Jonathan answered Saul, “David earnestly requested leave of me to go to Bethlehem.