Sahih al-Bukhari, Hadith 7136 ⓘ
Narrated Abu Huraira: The Prophet 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).
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا وُهَيْبٌ، حَدَّثَنَا ابْنُ طَاوُسٍ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " يُفْتَحُ الرَّدْمُ رَدْمُ يَأْجُوجَ وَمَأْجُوجَ مِثْلَ هَذِهِ " . وَعَقَدَ وُهَيْبٌ تِسْعِينَ.
also referenced under: Book 92, Hadith 83 (In-Book) & Volume 9, Book 88, Hadith 250 (USC-MSA)