Luke 21:6

As for these things (tauta). Accusative of general reference. One stone upon another (liqo epi liqwi). Stone upon stone (locative). Here both Mark 13:2 ; Matthew 24:2 have epi liqon (accusative). Instead of ouk apeqhsetai (future passive) they both have ou mh apeqh (double negative with aorist passive subjunctive). It was a shock to the disciples to hear this after the triumphal entry.