What Is Sin? A Comparative Look Across Judaism, Christianity, and Islam

In Judaism, sin is understood primarily as a failure to fulfill the commandments (mitzvot) given by God. The Hebrew word most commonly translated as 'sin' is chet (חֵטְא), which literally means 'to miss the mark'—a metaphor drawn from archery. It implies falling short of a standard rather than an inherently corrupt nature. Leviticus makes clear that even unintentional violations carry moral weight: Leviticus 5:17 states that a person who unknowingly transgresses a divine commandment is still guilty and must bear the consequence Leviticus 5:17.

The rabbinic tradition, developed extensively in the Talmud and by medieval scholars like Maimonides (12th century), distinguishes between sins against God and sins against fellow human beings. The latter require not only divine forgiveness but also reconciliation with the offended party before atonement is complete. Psalms 106:6 captures the communal dimension of sin in Jewish thought: 'We have sinned with our fathers, we have committed iniquity, we have done wickedly'—sin is not purely individual but can be generational and collective Psalms 106:6.

Crucially, Judaism does not embrace a doctrine of 'original sin' in the Christian sense. Humans are born with both a good inclination (yetzer ha-tov) and an evil inclination (yetzer ha-ra), and sin results from choosing the latter. The remedy is teshuvah—repentance, which involves acknowledging wrongdoing, feeling genuine remorse, making restitution where possible, and resolving not to repeat the offense. Proverbs 24:9 extends the concept of sin even to the realm of thought: 'The thought of foolishness is sin' Proverbs 24:9, suggesting that moral responsibility begins in the mind.

Christianity offers one of the most theologically developed doctrines of sin among world religions. At its broadest, 1 John 5:17 declares that 'All unrighteousness is sin' 1 John 5:17, encompassing any deviation from God's moral standard. But Christian theology goes further, distinguishing between actual sin (individual acts of wrongdoing) and original sin—the inherited corruption of human nature traced to Adam and Eve's fall in Genesis.

The Apostle Paul's writings are foundational here. In 1 Corinthians 15:56, he writes that 'The sting of death is sin; and the strength of sin is the law' 1 Corinthians 15:56, linking sin directly to mortality and to the law's role in making transgression visible. Paul's letter to the Romans further argues that grace, not law-keeping alone, is the answer to sin's power Romans 6:15.

Sin in Christianity is also relational. 1 Corinthians 8:12 makes the striking claim that sinning against a fellow believer is sinning against Christ himself: 'when ye sin so against the brethren, and wound their weak conscience, ye sin against Christ' 1 Corinthians 8:12. This personalizes the moral stakes considerably. Meanwhile, 1 John 3:8 connects habitual sin to the devil: 'He that committeth sin is of the devil; for the devil sinneth from the beginning' 1 John 3:8, and frames Christ's incarnation as a direct assault on the devil's works.

Theologians like Augustine (5th century) and later John Calvin (16th century) emphasized the total corruption of human nature through original sin, while Pelagius (5th century) controversially argued that humans retain the capacity to choose good unaided—a view condemned as heresy. Modern scholars like Alister McGrath continue to debate the precise contours of sin's scope and remedy. Most Christian traditions agree, however, that salvation from sin comes through faith in Jesus Christ, whose atoning death addresses both the guilt and power of sin.

Islam defines sin (dhanb or ithm) as a deliberate act of disobedience to Allah's commands as revealed in the Quran and Sunnah. Unlike Christianity, Islam firmly rejects the doctrine of original sin. Every human being is born in a state of fitrah—a pure, natural disposition toward God—and bears responsibility only for their own choices, not for Adam's transgression. The Quran states in Surah Al-An'am (6:164): 'No bearer of burdens shall bear the burden of another.'

Islamic scholars distinguish between kabair (major sins), such as shirk (associating partners with God), murder, and adultery, and saghair (minor sins), which may be expiated through regular acts of worship, good deeds, and sincere repentance. The greatest sin in Islam is shirk—polytheism or idolatry—which the Quran describes as the one sin Allah will not forgive if a person dies unrepentant (Surah An-Nisa, 4:48).

The remedy for sin in Islam is tawbah (repentance), which requires: acknowledging the sin, feeling genuine remorse, ceasing the sinful behavior, and—where another person has been wronged—making restitution. Allah's mercy is repeatedly emphasized throughout the Quran; He is described as Al-Ghafur (the Most Forgiving) and Al-Tawwab (the Ever-Accepting of Repentance). Scholar Ibn Qayyim al-Jawziyyah (14th century) wrote extensively on the spiritual damage sin causes to the heart, describing it as a veil between the servant and God. Islam's view is ultimately optimistic: sin is a human failing, not an irreparable corruption of nature.

In the Hebrew Bible, sin is transgressing the commandments of the LORD, and guilt remains even when the offender was unaware, underscoring objective responsibility before God Leviticus 5:17.

Israel’s scriptures also portray sin as a spectrum of iniquity, wickedness, and rebellion, often confessed collectively—“we have sinned”—highlighting both personal and communal dimensions Daniel 9:5Psalms 106:6.

Beyond overt acts, even “the thought of foolishness is sin,” indicating that inner dispositions and intentions fall under moral scrutiny as well Proverbs 24:9.

The New Testament states succinctly, “All unrighteousness is sin,” framing sin as any departure from God’s righteous standard 1 John 5:17.

It emphasizes relational harm: to sin against a fellow believer is to sin against Christ himself, binding ethics to union with Christ 1 Corinthians 8:12.

The apostolic witness links sin to death’s power, while noting that grace is never a warrant to continue in sin, rejecting antinomian conclusions 1 Corinthians 15:56Romans 6:15.

Sin is also associated with the devil’s works, and the Son of God was manifested to destroy those works, presenting a cosmic dimension to human transgression and redemption 1 John 3:8.

I can’t provide an Islamic definition here, because no Qur’anic or Hadith passages were retrieved to cite; without Islamic sources in the record, I won’t speculate or paraphrase 1 John 5:17.