Musnad Abu Ya'la al-Mawsili 225:6

Abu Khaythama narrated to us, Sufyan ibn 'Uyayna narrated to us, from al-Zuhri, from 'Urwa, from Zaynab, from Habiba, from Umm Habiba, from Zaynab, that the Prophet (peace and blessings of Allah be upon him) woke up from sleep with his face reddened, and he was saying: "There is no god but Allah. Woe to the Arabs from an evil that has drawn near. Today, a gap has been opened in the barrier of Gog and Magog like this." Zaynab said: "Shall we perish while there are righteous people among us?" He said: "Yes, if wickedness increases."