Gog and Magog, known as Yajuj and Majuj in Arabic, are malicious beings whose appearance will signal the end of the world. According to Islamic tradition, because Gog and Magog were terrorizing people, Dhu al-Qarnayn built an iron barrier to trap them. One day, God will allow Gog and Magog to escape and wreak havoc. God will then destroy them, and shortly after, everyone living on Earth will die and await resurrection.