'New moon' in the Bible

And David said to Jonathan, Behold, to-morrow is 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 until the third evening.

And Jonathan said to him, To-morrow is the new moon; and thou wilt be missed, for thy seat will be empty;

And David hid himself in the field; and it was the new moon, and the king sat at table to eat.

And it came to pass the next day after the new moon, the second day of the month, as David's place was empty, that Saul said to Jonathan his son, Why has not the son of Jesse come to table, neither yesterday nor to-day?

And Jonathan arose from the table in fierce anger, and ate no meat the second day of the new moon; for he was grieved for David, because his father had done him shame.