(25) باب عَلاَمَاتِ النُّبُوَّةِ فِي الإِسْلاَمِ
Narrated Zainab bint Jahsh:
That the Prophet (ﷺ) came to her in a state of fear saying, "None has the right to be worshiped but Allah! Woe to the Arabs because of evil that has come near. Today a hole has been made in the wall of Gog and Magog as large as this." pointing with two of his fingers making a circle. Zainab said, "I said, 'O Allah's Messenger (ﷺ)! Shall we be destroyed though amongst us there are pious people? ' He said, 'Yes, if evil increases."
Reference: Sahih al-Bukhari 3598
In-book reference: Book 61, Hadith 106
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 56, Hadith 797