The term fasād (corruption) and its derivatives occur approximately fifty times in the Holy Qur’an. Their meanings vary according to the issues addressed by the verses in which they appear. The term fasād is closely associated with the word “earth.” The two occur together, either explicitly or by implication, in most of the approximately fifty instances. This association reflects the broad scope of corruption, which has spread throughout human society. Corruption is not part of the original human disposition. Rather, it represents a departure from the sound innate nature (fiṭrah) upon which human beings were created. The Qur’an states: “So direct your face toward the religion, inclining to the truth—the natural disposition of Allah upon which He created humankind” (Qur’an 30:30). A study of the verses containing fasād and its derivatives reveals several causes of corruption. The most important are following personal desires, allowing blessings to make a person forget their Bestower, transgression, and allegiance to unbelievers. The study identifies five principal foundations of corruption: public and concealed indecency, sin, unjust aggression, associating partners with Allah, and speaking about Allah without knowledge. Humanity remained in a state of righteousness for a long period. Corruption then arose among people. Allah sent messengers and revealed scriptures and laws to address it. This process culminated in the law brought by the Prophet Muhammad (peace be upon him), who completed the reformative mission of the earlier prophets.