'Month' in the Bible

In the fortieth year, on the first day of the eleventh month, Moses spoke to the children of Israel in accordance with all that the Lord had commanded him to say to them,

“Observe the month of Abib and celebrate the Passover to the Lord your God, for in the month of Abib the Lord your God brought you out of Egypt by night.

She shall take off the clothes of her captivity and remain in your house, and weep (mourn) for her father and her mother a full month. After that you may go in to her and be her husband and she shall be your wife.