'Months' in the Bible

You are to sound the trumpets over your burnt offerings and your fellowship sacrifices and on your joyous occasions, your appointed festivals, and the beginning of each of your months. They will serve as a reminder for you before your God: I am Yahweh your God.”

“At the beginning of each of your months present a burnt offering to the Lord: two young bulls, one ram, seven male lambs a year old—all unblemished—

Their drink offerings are to be two quarts of wine with each bull, one and a third quarts with the ram, and one quart with each male lamb. This is the monthly burnt offering for all the months of the year.