It is narrated from Sayyidah Zaynab bint Jahsh (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) came in to her alarmed, and he (peace and blessings be upon him) was saying: "Woe to the Arabs from an evil that has drawn near! Today an opening like this has been made in the barrier of Ya'juj and Ma'juj (Gog and Magog)" and he made a circle with his thumb and the finger next to it. Sayyidah Zaynab (may Allah be pleased with her) said: So I said: O Messenger of Allah! Shall we be destroyed while there are righteous people among us? He (peace and blessings be upon him) said: "Yes, when wickedness becomes widespread."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20507