Sahih Muslim 2882 a
Harith b Abi Rabi'a and 'Abdullah b. Safwan both went to Umm Salama, the Mother of the Faithful, and they asked her about the army which would be sunk in the earth, and this relates to the time when Ibn Zubair (was the governor of Mecca). She reported that Allah's Messenger (ﷺ) had said that a seeker of refuge would seek refuge in the Sacred House and an army would be sent to him (in order to kill him) and when it would enter a plain ground, it would be made to sink. I said:
Allah's Messenger, what about him who would be made to accompany this army willy nilly? Thereupon he said: He would be made to sink along with them but he would be raised on the Day of Resurrection on the basis of his intention. Abu Ja'far said. ' This plain, ground means the plain ground of Medina.
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، وَأَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ - وَاللَّفْظُ
 لِقُتَيْبَةَ - قَالَ إِسْحَاقُ أَخْبَرَنَا وَقَالَ الآخَرَانِ، حَدَّثَنَا جَرِيرٌ، عَنْ عَبْدِ الْعَزِيزِ بْنِ رُفَيْعٍ، عَنْ 
 عُبَيْدِ اللَّهِ ابْنِ الْقِبْطِيَّةِ، قَالَ دَخَلَ الْحَارِثُ بْنُ أَبِي رَبِيعَةَ وَعَبْدُ اللَّهِ بْنُ صَفْوَانَ وَأَنَا مَعَهُمَا،
 عَلَى أُمِّ سَلَمَةَ أُمِّ الْمُؤْمِنِينَ فَسَأَلاَهَا عَنِ الْجَيْشِ الَّذِي يُخْسَفُ بِهِ وَكَانَ ذَلِكَ فِي أَيَّامِ ابْنِ
 الزُّبَيْرِ فَقَالَتْ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ يَعُوذُ عَائِذٌ بِالْبَيْتِ فَيُبْعَثُ إِلَيْهِ بَعْثٌ
 فَإِذَا كَانُوا بِبَيْدَاءَ مِنَ الأَرْضِ خُسِفَ بِهِمْ ‏"‏ ‏.‏ فَقُلْتُ يَا رَسُولَ اللَّهِ فَكَيْفَ بِمَنْ كَانَ كَارِهًا
 قَالَ ‏"‏ يُخْسَفُ بِهِ مَعَهُمْ وَلَكِنَّهُ يُبْعَثُ يَوْمَ الْقِيَامَةِ عَلَى نِيَّتِهِ ‏"‏ ‏.‏ وَقَالَ أَبُو جَعْفَرٍ هِيَ بَيْدَاءُ
 الْمَدِينَةِ ‏.‏