Luke 17:31

17:31 On that day, anyone who is on the roof, with his goods in the house, must not come down to take them away, and likewise the person in the field must not turn back.

Luke 22:36

22:36 He said to them, “But now, the one who has a money bag must take it, and likewise a traveler’s bag too. And the one who has no sword must sell his cloak and buy one.

sn Most of the roofs in the NT were flat roofs made of pounded dirt, sometimes mixed with lime or stones, supported by heavy wooden beams. They generally had an easy means of access, either a sturdy wooden ladder or stone stairway, sometimes on the outside of the house.

sn The swiftness and devastation of the judgment will require a swift escape. There is no time to come down from one’s roof and pick up anything from inside one’s home.

tn The syntax of this verse is disputed, resulting in various translations. The major options are either (1) that reflected in the translation or (2) that those who have a money bag and traveler’s bag should get a sword, just as those who do not have these items should sell their cloak to buy a sword. The point of all the options is that things have changed and one now needs full provisions. Opposition will come. But “sword” is a figure for preparing to fight. See Luke 22:50-51.

tn Or possibly “beggar’s bag” (L&N 6.145).