The preliminary section of the previous chapter, paragraphs 3486-3489, explained what the Lord has taught and foretold about the Last Judgement or last days of the Church in Matthew 24:8-14. In the preliminary section of the present chapter there now follows, in the section-by-section method of presentation that has been adopted, the explanation of verses 15-18 of that chapter in Matthew,

When therefore you see the abomination of desolation, spoken of by the prophet Daniel, standing in the holy place - let him who is reading this take note - then let those who are in Judea flee into the mountains. Let him who is on the roof of the house not go down to take anything out of his house; and let him who is in the field not turn back to get his clothing.