[Machine] I heard the Messenger of Allah, peace be upon him, say, "The barrier of Yajuj and Majuj will be opened, as Allah, mighty and majestic, has said, 'From every hole they will emerge.' " (Quran 21:96). Ibn Ishaq said in the recitation of Abdullah, "From every grave they will emerge," using the letter "jeem" and "thaa," like His saying, 'From the graves they will emerge.' " (Quran 36:51). And they are the graves.  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ تُفْتَحُ يَأْجُوجُ وَمَأْجُوجُ كَمَا قَالَ اللَّهُ ﷻ {مِنْ كُلِّ حَدَبٍ يَنْسِلُونَ} [الأنبياء 96] قَالَ ابْنُ إِسْحَاقَ فِي قِرَاءَةِ عَبْدِ اللَّهِ مِنْ كُلِّ جَدَثٍ يَنْسِلُونَ بِالْجِيمِ وَالثَّاءِ مِثْلَ قَوْلِهِ {مِنَ الْأَجْدَاثِ إِلَى رَبِّهِمْ يَنْسِلُونَ} [يس 51] وَهِيَ الْقُبُورُ