Narrated Abu Huraira: Allah's Messenger (ﷺ) said, "There are angels at the mountain passes of Medina (so that) neither plague nor Ad-Dajjal can enter it.'

Narrated Zainab bint Jahsh: That one day Allah's Messenger (ﷺ) 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 (ﷺ) 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 (ﷺ) said, "Yes, if the (number) of evil (persons) increased."

Narrated Abu Huraira: The Prophet (ﷺ) said, "A hole has been opened in the dam of Gog and Magog." Wuhaib (the sub-narrator) made the number 90 (with his index finger and thumb).