Answer
Sayyid Qutb’s magnum opus, Fi Zilal al-Quran, is a 30-volume commentary on the Quran. It was written in the 1950s and 1960s, and is considered one of the most important works of Islamic thought in modern history. The commentary is a comprehensive and scholarly treatment of the Quran, and Qutb draws on a wide range of sources, including the Quran itself, hadith, and the writings of other Muslim scholars.