Narrated Zainab bint Jahsh: That one day Allah's Apostle entered upon her in a state of fear and said, None has the right to be worshipped but Allah! Woe to the Arabs from the Great evil that has approached (them). Today a hole has been opened in the dam of Gog and Magog like this. The Prophet made a circle with his index finger and thumb. Zainab bint Jahsh added: I said, O Alllah's Apostle! Shall we be destroyed though there will be righteous people among us? The Prophet said, Yes, if the (number) of evil (persons) increased.