We all sin, but how many of us commit major sins without even realizing? In this lecture, shaikh Abdur Raheem Green acquaints us with some of the major sins, including to speak about Allah and His religion without knowledge. Some scholars said this is worse than shirk, and Br Green discusses the reasoning behind this. Other major and often neglected sins include arrogance and pride, to support the disbelievers against the believers, magic and fortune telling, showing off and innovation in the religion.