when
Verses 20, 24 (Luke 21:20); (Luke 21:24) are not included in the report of the Olivet discourse as given by Matthew and Mark. Two sieges of Jerusalem are in view in that discourse. (Luke 21:20-24) refers to the siege by Titus, A.D. 70, when the city was taken, and verse 24 (Luke 21:24) literally fulfilled. But that siege and its horrors but adumbrate the final siege at the end of this age, in which the "great tribulation" culminates. At that time the city will be taken, but delivered by the glorious appearing of the Lord (Revelation 19:11-21). The references in; (Matthew 24:15-28); (Mark 13:14-26) are to the final tribulation siege; (Luke 21:20-24) to the destruction of Jerusalem by Titus. In Luke the sign is the compassing of Jerusalem by armies (Luke 21:20) in; (Matthew 24:15); (Mark 13:14) the sign is the abomination in the holy place. (2 Thessalonians 2:4).