What are the two biggest sins in Islam?

The Grave Sins in Islam: Understanding Major Transgressions

In Islam, certain acts are considered so severe that they are classified as the seven major sins, often highlighted in the teachings of Prophet Muhammad (peace be upon him). While all sins are taken seriously, these carry particularly grave consequences. The most serious of them all is shirk—the act of associating partners with Allah. This is not only the greatest sin but is considered unforgivable unless repented before death. The Qur’an emphasizes that Allah may forgive any sin except shirk, underscoring its severity.

Another major sin is witchcraft (sihr), which involves manipulating reality through forbidden supernatural means. Islam firmly rejects such practices, viewing them as both a spiritual and moral corruption. Taking an innocent life unjustly is also among the gravest offenses—so much so that the Qur’an equates killing one person unjustly with killing all of humanity.

Preying on the vulnerable is equally condemned. Consuming the wealth of orphans is directly forbidden, and Allah warns of severe punishment for those who exploit the weak. Similarly, riba (usury or interest) is strongly denounced not only for its economic injustice but for how it erodes compassion and fairness in society.

Other major sins include fleeing from the battlefield when Muslims are called to defend justice, and slandering chaste, innocent women—a crime that attacks dignity and spreads corruption. The Prophet (peace be upon him) emphasized that these sins undermine both individual conscience and communal trust.

While the list includes seven major sins, Islam remains a religion of mercy. Repentance, sincere remorse, and a commitment to change are always open doors. But awareness of these transgressions serves as a moral compass, guiding believers toward accountability, justice, and closeness to Allah.