Sahih Muslim Book 54, Hadith 8
An army would attack this House in order to fight against the inhabitants of this House and when it would be at the plain ground the ranks in the centre of the army would be sunk and the vanguard would call the rear flanks of the army and they would also be sunk and no flank would be left except some people who would go to inform them (their kith and kin). A person (who had been listening to this hadith from Abdullah b. Safwan) said: I bear testimony in regard to you that you are not imputing a lie to Hafsa. And I bear testimony to the fact that Hafsa is not telling a lie about Allah's Apostle (ﷺ).
" When I met Abu Ja'far I told him that she (simply) meant the plain ground. Thereupon Abu Ja'far said: No, by God, she meant the plain ground of Medina.
They would soon seek protection in this House, viz. Ka'ba (the defenceless), people who would have nothing to protect themselves in the shape of weapons or the strength of the people. An army would be sent to fight (and kill) them and when they would enter a plain ground the army would be sunk in it. Yusuf (one of the narrators) said: It was a people of Syria (hordes of Hajjaj) who had been on that day coming towards Mecca for an attack (on 'Abdulllah b. Zubair) and Abdullah b. Safwan said: By God, it does not imply this army.