'New Moon' in the Bible

David said to Jonathan, "Behold, tomorrow is the new moon, and I should not fail to dine with the king; but let me go, that I may hide myself in the field to the third day at evening.

Then Jonathan said to him, "Tomorrow is the new moon: and you will be missed, because your seat will be empty.

So David hid himself in the field: and when the new moon had come, the king sat him down to eat food.

It happened on the next day after the new moon, the second day, that David's place was empty. Saul said to Jonathan his son, "Why doesn't the son of Jesse come to eat, neither yesterday, nor today?"