'Moon' in the Bible

And David said unto Jonathan, Behold, to morrow is the new moon, and I should not fail to sit with the king at meat: but let me go, that I may hide myself in the field unto the third day at even.

Then Jonathan said to David, To morrow is the new moon: and thou shalt be missed, because thy seat will be empty.

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

However, the day after the New Moon, the second day, David’s place was still empty, and Saul asked his son Jonathan, “Why didn’t Jesse’s son come to the meal either yesterday or today?”

He got up from the table in fierce anger and did not eat any food that second day of the New Moon, for he was grieved because of his father’s shameful behavior toward David.