What is An-Nasi' (intercalation) mentioned in the Quran?

According to classical scholars like Ibn Kathir, An-Nasi' was the pre-Islamic practice of postponing the sanctity of a sacred month, like Muharram, to another month, like Safar. This tampering allowed them to engage in warfare during a sacred month while outwardly maintaining the number of four sacred months per year. [11, 16]

Why does the Quran call tampering with months an 'addition to disbelief'?

Quran 9:37 calls intercalation an 'addition to disbelief' because it was a deliberate manipulation of God's divine law for worldly gain. It represented a rebellion against Allah's authority over time and sacred ordinances, layering the sin of legalizing the forbidden on top of their existing disbelief. [2, 6]

How did the practice of Nasi' affect the Hajj pilgrimage?

The practice of Nasi', which could involve adding a 13th month to synchronize the lunar calendar with the seasons, affected the Hajj by attempting to fix it in a specific season favorable for trade. [1, 7] This human intervention was nullified by Islam, re-establishing a purely lunar calendar where Hajj rotates through all seasons, a sign of submission to divine timing.

Intercalation (An-Nasi') in Pre-Islamic Arabia: An Act of Disbelief in the Quran

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disbelievers tamper with annual intercalation

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🕌At-Tawbah9:37

At a Glance

According to search-discovered classical Islamic scholarship, An-Nasi' (النَّسِيءُ) was the pre-Islamic Arab practice of tampering with the divine calendar, specifically by postponing the sanctity of one of the four sacred months. As detailed in the tafsir of scholars like Ibn Kathir and Al-Tabari on Quran 9:37, this was often done to make a sacred month profane for the purpose of warfare, and then declaring a profane month sacred to outwardly conform to the total number of four. [3, 11] The Quran condemns this act unequivocally as a 'ziyadatun fil-kufr'—an 'addition to disbelief'—because it constituted a direct defiance of Allah's ordained law and a manipulation of sacred time for worldly convenience. This prohibition re-established the absolute authority of the divinely fixed 12-month lunar calendar, ensuring that sacred rites like the Hajj would forever follow a divine, not human, schedule.

📖 Quranic Context

A critical verse that re-established the sanctity and immutability of the divinely ordained lunar calendar.

Its prohibition represents the restoration of Allah's authority over time and sacred rituals, removing human tampering.

References: Specifically addressed and condemned in Quran 9:37.

💭 Theological Perspective

Represents humanity's tendency to alter divine law for worldly convenience, such as enabling warfare or aligning trade with seasons.

Demonstrates how evil deeds can be made to seem appealing (zuyyina lahum) to those who persist in disbelief.

The prohibition of An-Nasi' was a pivotal act of divine guidance, fixing the Islamic rituals (like Hajj) to their correct lunar timings and purifying the calendar.

Submission to the fixed Islamic calendar, without human alteration, is an act of faith and trust in the divine wisdom.

📜 Hadith Perspective

The Prophet's Farewell Sermon referenced the correction of time, stating, 'Time has come back to its original state which it had when Allah created the heavens and the earth.'

The restoration of the calendar
The finality of the 12-month year
The sanctity of the four sacred months

Universal agreement that An-Nasi' was a pre-Islamic practice abolished by the Quran and the Prophet Muhammad ﷺ.

💎 Deeper Insights

The prohibition of An-Nasi' was a divine act of 'reclaiming time.' The pre-Islamic Arabs, through the authority of the al-Qalammas of Banu Kinanah, had seized control of the calendar. Quran 9:37 permanently returned the authority over sacred time to Allah alone, making the calendar itself an act of worship and submission.

— Ibn Kathir, Al-Qurtubi

The verse exposes a timeless formula for self-deception: 'liyuwati'u 'iddata ma harrama Allah' (to correspond to the number made unlawful by Allah). This reveals a psychological trick where people justify violating the spirit of a divine law by superficially adhering to its letter. The disbelievers felt righteous because they still observed four sacred months, despite violating the specific ones God had chosen.

— Consensus of Mufassirun

Explore Verses Related to disbelievers tamper with annual intercalation

At a Glance

📖 Quranic Context

💭 Theological Perspective

📜 Hadith Perspective

💎 Deeper Insights

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