The sin that is considered unforgivable in Islam, if not repented of, is shirk, which is the act of associating partners with Allah (God).
Islam emphasizes the absolute oneness of Allah (Tawhid), making shirk the most grievous offense. The Quran explicitly states that Allah does not forgive shirk if a person dies without repenting. Other sins, however, are forgivable if Allah wills, especially if sincere repentance (Tawbah) is performed.
Here's a breakdown:
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Shirk (Associating Partners with Allah): This includes worshipping idols, attributing divine qualities to created beings, or placing anything on par with Allah.
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Forgiveness: While Allah is merciful and forgiving, the Quran singles out shirk as an unforgivable sin if the person dies without repenting.
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Repentance (Tawbah): Sincere repentance, which involves acknowledging the sin, feeling remorse, seeking forgiveness from Allah, and resolving not to repeat the sin, can lead to forgiveness even for major sins, including shirk.
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Other Sins: All other sins besides shirk are forgivable by Allah, according to His will and wisdom. Factors such as sincere repentance, good deeds, and Allah's mercy can lead to forgiveness.
Quranic Verse:
The Quran (Surah An-Nisa, 4:48) states: "Indeed, Allah does not forgive association with Him, but He forgives what is less than that for whom He wills. And he who associates others with Allah has certainly fabricated a tremendous sin." This verse is often cited to emphasize the gravity of shirk.
In summary: Shirk, associating partners with Allah, is the only sin that is explicitly stated to be unforgivable if a person dies without repenting. Sincere repentance before death provides a path to forgiveness, even for shirk.
