I’m still trying to find in the Bible where it mentions 13 months. Where do you find proof for this?
The Bible never provides an exact number of months for the biblical year. What it does provide is the method to begin the year and count each subsequent month. The Bible confirms that the first month of the biblical year is called “Abib.” Deuteronomy 16:1 states, “Observe the month of Abib, and keep the passover unto Yahweh thy Elohim: for in the month of Abib Yahweh thy Elohim brought thee forth out of Egypt by night.”
The word “observe” comes from the Hebrew shamar and means to guard. It also conveys the idea of watching. The word “month” derives from the Hebrew chodesh. Strong’s defines this word as, new moon and by extension, a month. Lastly, the word “Abib” is Hebrew and means, young ears of grain. Exodus 9:31 verifies that the grain spoken of is barley. It states that the barley was in the “ear” or Abib near the Passover observance (occurring on the 14th day of the first month, Lev. 23:5). Agriculturally, the wheat harvest begins in the third month, approximately two months after the beginning of the barley harvest.
These facts help in determining how to begin the biblical year. Deuteronomy 16:1 is literally commanding that we look for the new moon within the month of green ears. Agriculturally, Abib refers to when the barley enters the late dough stage, i.e., when the grain can be parched or roasted.
Therefore, Abib begins at the new moon crescent when there is barley in the dough stage or later. This occurs between March and April. Each subsequent month then begins with the sighting of the new moon crescent. Since there is an 11-day difference between the solar and lunar year, every 2-3 years a 13th month must be added to keep the seasons aligned. The Jews call this month Adar II. The Bible does not mention a 13th month.
The New Unger’s Bible Dictionary confirms this method, “The months began with the new moon, but the first month was fixed (after the Exodus and by the necessities of the Passover) by the ripening of the earliest grain, namely, barley.”
Additional evidence is found from the International Standard Bible Encyclopaedia, “…Abib is not properly a name of a month, but part of a descriptive phrase, ‘the month of young ears of grain.’ This may indicate the Israelitish way of determining the new year (Ex 12:2), the year beginning with the new moon nearest or next preceding this stage of the growth of the barley.”
Since Exodus 9:31 and 12:2 shows that the barley was in Abib before the new moon crescent, this is the pattern YRM uses to fix the month of Abib.
It’s important to note that in the 4th century, Hillel II changed the biblical calendar and transitioned from a calendar based on observation to calculation, including using the conjunction to begin the month and the autumnal equinox to begin the year. Since the autumnal equinox occurs in the fall, corresponding to the 7th Jewish month, the Jews count backwards to mark the first biblical month. Along the way, they also add their postponements, ensuring that days like Yom Kippur does not occur alongside of a weekly Sabbath. To ensure the alignment of the seasons, they also employ a 19-year cycle, adding a 13th month at intervals of 2-3 years.
For more information on the Biblical calander check out our free booklet : The Biblical Calander
Also, watch our video, Deciphering the Biblical Calendar: