“The one on the housetop
Must not go down.
He must not
Enter his house,
ὁ ἐπὶ τοῦ δώματος μὴ καταβάτω μηδὲ εἰσελθάτω τι ἆραι ἐκ τῆς οἰκίας αὐτοῦ,
This is almost word for word in Matthew, chapter 24:17, but not in Luke. Mark said that during these end times, the people on the housetop or roofs of their houses (ὁ ἐπὶ τοῦ δώματος) should not go down (μὴ καταβάτω) and enter their house (μηδὲ εἰσελθάτω τι) to take anything out of there (ἆραι τὰ ἐκ τῆς οἰκίας αὐτοῦ). It would be useless to do so, as the world was coming to an end.