'New Moon' in the Bible

And it shall be the prince's part to supply the burnt-offerings, and the oblation, and the drink-offering, at the feasts, and at the new moons, and on the sabbaths, in all the solemnities of the house of Israel: it is he that shall prepare the sin-offering, and the oblation, and the burnt-offering, and the peace-offerings, to make atonement for the house of Israel.

Thus saith the Lord Jehovah: The gate of the inner court that looketh toward the east shall be shut the six working-days; but on the sabbath-day it shall be opened, and on the day of the new moon it shall be opened.

And the people of the land shall worship at the door of this gate before Jehovah on the sabbaths and on the new moons.

And on the day of the new moon, a young bullock without blemish, and six lambs, and a ram: they shall be without blemish.