'New Moon' in the Bible

So David said to Jonathan, “Behold, tomorrow is the new moon, and I ought to sit down to eat with the king. But let me go, that I may hide myself in the field until the third 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 in the field; and when the new moon came, the king sat down to eat food.

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

Then Jonathan arose from the table in fierce anger, and did not eat food on the second day of the new moon, for he was grieved over David because his father had dishonored him.