Bede the Venerable — as excerpted in the Catena Aurea on Mark 13:14-20

“(ubi sup.) Then let him who is on the house-top, that is, whose mind rises above carnal deeds, and who lives spiritually, as it were in the free air, not come down to the base acts of his former conversation, nor seek again those things which he had left, the desires of the world or the flesh. For our house either means this world, or that in which we live, our own flesh.”