Imam al-Dhahabi's classic work, 'Kitab al-Kaba'ir' (The Book of Major Sins), is an essential guide for every Muslim seeking to understand and avoid grave transgressions. Drawing extensively from the Quran and the Sunnah, the author meticulously identifies and elaborates on seventy major sins, explaining their spiritual and worldly consequences. This monumental text serves as both a stern warning and a merciful call to repentance, providing clear guidance on the path of righteousness. It remains a vital resource for studying Islamic ethics and striving for a life that is pleasing to God.