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Title: Nasi'  
Author: World Heritage Encyclopedia
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Subject: Islamic calendar, Intercalation (timekeeping), Calendar
Collection: Islamic Calendar, Quranic Words and Phrases
Publisher: World Heritage Encyclopedia


Nasīʾ (Arabic: النسيء‎; lit. "postponement") is a concept mentioned by the Qur'an and linked to the four forbidden months.[1] In pre-Islamic Arabia, the decision of postponement was administered by the tribe of Kinanah,[2] by a man known as the al-Qalammas (pl. qalāmisa).[3] Different interpretations of its meaning have been proposed.


  • As postponement not related to a fixed calendar 1
  • As intercalation 2
  • Prohibiting Nasīʾ 3
  • See also 4
  • References 5

As postponement not related to a fixed calendar

Some scholars, both Muslim[4][5] and Western,[1][2] maintain that the pre-Islamic calendar used in Central Arabia was a purely lunar calendar similar to the modern Islamic calendar. According to this view, Nasīʾ is related to the Pagan practices of the Meccan Arabs, where they would alter the distribution of the forbidden months within a given year without implying a calendar manipulation. This interpretation is supported by Arab historians and lexicographers, like Ibn Hisham, Ibn Manzur, and the corpus of Qur'anic exegesis.[6] It is also corroborated by an early Sabaic inscription, where a religious ritual was "postponed" (ns'ʾw) due to war. According to the context of this inscription, the verb ns'ʾ has nothing to do with intercalation, but only with moving religious events within the calendar itself. The similarity between the religious concept of this ancient inscription and the Qur'an suggests that non-calendaring postponement is also the Qur'anic meaning of Nasīʾ.[1] Thus the Encyclopaedia of Islam concludes that the "The Arabic system of [Nasīʾ] can only have been intended to move the HAJJ and the fairs associated with it in the vicinity of Mecca to a suitable season of the year. It was not intended to establish a fixed calendar to be generally observed."[7]

As intercalation

Others concur that the pre-Islamic calendar was originally a lunar calendar, but suggest that about 200 years before the Hijra it was transformed into a lunisolar calendar containing an intercalary month added from time to time to keep the pilgrimage within the season of the year when merchandise was most abundant. This interpretation was first proposed by the medieval Muslim astrologer and astronomer Abu Ma'shar al-Balkhi, and later by al-Biruni,[3][8] al-Mas'udi, and some Western scholars.[9] This interpretation considers Nasīʾ to be a synonym to the Arabic word for "intercalation" (kabīsa). It also suggests that every second or third year the beginning of the year was postponed by one month. The intercalation doubled the month of the pilgrimage, that is, the month of the pilgrimage and the following month were given the same name, postponing the names and the sanctity of all subsequent months in the year by one. The first intercalation doubled the first month Muharram, then three years later the second month Safar was doubled, continuing until the intercalation had passed through all twelve months of the year and returned to Muharram, when it was repeated. The Arabs, according to one explanation mentioned by Abu Ma'shar, learned of this type of intercalation from the Jews.[2][3][8]

Prohibiting Nasīʾ

In the tenth year of the Hijra, as documented in the Qur'an (sura 9:36–37), God revealed the "prohibition of the Nasīʾ".

The number of months with Allah has been twelve months by Allah's ordinance since the day He created the heavens and the earth. Of these four are known as forbidden [to fight in]; That is the straight usage, so do not wrong yourselves therein, and fight those who go astray. But know that Allah is with those who restrain themselves.
Verily the transposing (of a prohibited month) is an addition to Unbelief: The Unbelievers are led to wrong thereby: for they make it lawful one year, and forbidden another year, of months forbidden by Allah and make such forbidden ones lawful. The evil of their course seems pleasing to them. But Allah guideth not those who reject Faith.
Sura 9 (At-Tawba), ayat 36-37[10]

The prohibition of Nasīʾ would presumably have been announced when the intercalated month had returned to its position just before the month of Nasi' began. If Nasīʾ meant intercalation, then the number and the position of the intercalary months between 1 AH and 10 AH are uncertain; Western calendar dates commonly cited for key events in early Islam such as the Hijra, the Battle of Badr, the Battle of Uhud and the Battle of the Trench, should be viewed with caution as they might be in error by one, two or even three lunar months.

This prohibition was mentioned by Muhammad during the farewell sermon which was delivered on 9 Dhu al-Hijja 10 AH (Julian date Friday March 6, AD 632) on Mount Arafat during the farewell pilgrimage to Mecca.

Certainly the Nasi' is an impious addition, which has led the infidels into error. One year they authorise the Nasi', another year they forbid it. They observe the divine precept with respect to the number of the sacred months, but in fact they profane that which God has declared to be inviolable, and sanctify that which God has declared to be profane. Assuredly time, in its revolution, has returned to such as it was at the creation of the heavens and the earth. In the eyes of God the number of the months is twelve. Among these twelve months four are sacred, namely, Rajab, which stands alone, and three others which are consecutive.
—translated by Sherrard Beaumont Burnaby[11]

The three successive forbidden months mentioned by Muhammad (months in which battles are forbidden) are Dhu al-Qi'dah, Dhu al-Hijjah, and Muharram, months 11, 12, and 1. The single forbidden month is Rajab, month 7. These months were considered forbidden both within the new Islamic calendar and within the old pagan Meccan calendar.

See also


  1. ^ a b c F.C. De Blois, "TAʾRĪKH": I.1.iv. "Pre-Islamic and agricultural calendars of the Arabian peninsula", The Encyclopaedia of Islam, 2nd edition, X:260.
  2. ^ a b c A. Moberg, "NASI'", The Encyclopaedia of Islam, 2nd, VII:977.
  3. ^ a b c Abu Ma'shar al-Balkhi (787–886), Kitab al-Uluf, Journal Asiatique, series 5, xi (1858) 168+. (French) (Arabic)
  4. ^ Mahmud Effendi (1858), as discussed in Sherrard Beaumont Burnaby, Elements of the Jewish and Muhammadan calendars (London: 1901), pp. 460–470.
  5. ^ According to "Tradition", repeatedly cited by F.C. De Blois.
  6. ^ Muḥammad al-Khuḍarī Bayk (1935). Muḥāḍarāt tārīkh al-Umam al-Islāmiyya 2 (4th ed.). Al-maktaba al-tijāriyya. pp. 59–60. 
  7. ^ The Encyclopedia of Islam, 2nd edition, Index, p. 441
  8. ^ a b al-Biruni, The Chronology of Ancient Nations"Intercalation of the Ancient Arabs", , tr. C. Edward Sachau, (London: William H. Allen, 1000/1879) 13–14, 73–74.
  9. ^ A. Moberg, "NASI'", E.J. Brill's first encyclopaedia of Islam
  10. ^ Quran 9:36–37
  11. ^ Sherrard Beaumont Burnaby, Elements of the Jewish and Muhammadan calendars (London: 1901) 370.
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